For a fix with no torch, get the SharkBite Max UR008A: it pushes onto copper and any standard PEX. For crimped PEX, sweat on SharkBite’s UC600LF. For Uponor PEX-A, use Uponor’s LF4515050.
Top pick: SharkBite Max UR008A$9.36 at AmazonPrice as of Oct 24, 2026, 5:30 AM EDT
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.com at the time of purchase will apply to the purchase of this product.
How the three compare on our spec score
Five checks from each maker’s own pages, sheets and warranty, equal weight. The rules and every input are in the method section near the end.
PlumbingPicks spec score out of 10, from SharkBite’s and Uponor’s product pages, spec sheets and warranties, read Oct 22, 2026. It is not a customer rating or a lab test of our own.
All three join 1/2 in. copper to 1/2 in. PEX. What changes is how each end is made: pushed, crimped, expanded or soldered.
The SharkBite Max scored highest because it takes any standard PEX, needs no torch, and holds the highest rating when hot. The two sweat adapters tie: SharkBite’s fits more PEX, and Uponor’s publishes flow data.
Each pick, in detail
What each maker publishes, what it means when you tie new PEX into old copper, and where each one lost points on our checks.
1/2 in. CTSPush both ends400 psi200°FDZR brassASSE 1061
Buy it if
You’re cutting into old copper to tie in PEX, the line may still drip, or you’d rather not use a torch.
Skip it if
You want the joint buried in a slab. SharkBite says no joints within a slab.
The SharkBite Max UR008A is the adapter I’d grab first, and I’ve used it. SharkBite says it connects PEX, copper, CPVC, PE-RT or HDPE SDR-9 pipe in any combination, so the same coupling turns a copper stub into a PEX run.
There’s no torch, crimp tool or glue. SharkBite says it can go on wet lines and be pressure tested right away, which matters when you can’t get a line fully dry. That earned a 10 on the copper-side joint.
It takes any PEX made to ASTM F876, and SharkBite says no tube liner is needed for PEX. That’s a 10 on PEX it accepts.
SharkBite rates it to 400 psi at 200°F on copper, the highest rating here, a 10. On PEX or CPVC, SharkBite says to use the pipe’s own rating.
The warranty is 25 years with copper, PEX or CPVC under RWC’s warranty, without needing SharkBite’s own pipe. That’s a 10.
Where it lost points: SharkBite doesn’t publish a flow coefficient or equivalent length for the coupling, so flow data scored a 5.
Two rules from SharkBite’s instructions are easy to miss. Mark the 1 in. insertion depth and push to the tube stop. And if you solder nearby, make the solder joints first; SharkBite says flame shouldn’t be used close to a Max fitting.
It’s listed to ASSE 1061, NSF/ANSI/CAN 61 and 372, and SharkBite approves it behind walls without access panels. It was sold by Amazon.com, single, on Oct 22, 2026.
It also comes off. SharkBite says it’s removable with its disconnect clip, tongs or pro disconnect tool, and it can be rotated after it’s installed. The same coupling comes in 3/4 in. (UR016A) and 1 in. (UR020A).
My call: buy a depth and deburr gauge with it if you don’t have one; a short push is the usual leak.
Best for crimp or clamp PEX systems
SharkBite UC600LF crimp sweat
SharkBite UC600LF 1/2 in. brass crimp female sweat adapter, pack of 10
Product photo: Amazon. The fitting is stamped Cash Acme, an RWC brand alongside SharkBite.
PEX end takes copper crimp rings or stainless clamps
Made for all PEX tubing, per SharkBite
Listed to ASTM F1807 and NSF/ANSI/CAN 61
Lead-free DZR silicon brass
Pack of 10 for a repipe
Cons
Needs a torch on the copper side
Needs a crimp or clamp tool on the PEX side
80 psi at 200°F, 100 psi at 180°F
25 years only with SharkBite PEX; 5 years with other PEX
1/2 in.Crimp x female sweat100 psi at 180°F160 psi at 73°FC69300 brassASTM F1807
Buy it if
Your PEX runs on crimp rings or cinch clamps, and you want a soldered joint on the copper.
Skip it if
You can’t use a torch where the copper is. Use the SharkBite Max.
SharkBite’s UC600LF is the sweat adapter for crimp and clamp PEX, and I’ve used it. SharkBite puts it plainly: transition from PEX to copper, sweat a female adapter onto copper pipe.
The PEX end is a barb that takes copper crimp rings or stainless steel clamp rings. SharkBite’s spec sheet says its crimp fittings are designed for use with all PEX tubing, so PEX it accepts scored a 10.
The copper end is a female cup that slides over 1/2 in. copper pipe and gets soldered. That needs a torch, so the copper-side joint scored a 7.
Ratings come from SharkBite’s crimp spec sheet: 160 psi at 73.4°F, 100 psi at 180°F, 80 psi at 200°F. That’s an 8 on rating when hot, lower than the push coupling, as with every crimp adapter rated this way.
Warranty is the other split. RWC gives 25 years with SharkBite PEX and SharkBite rings, but 5 years with other makers’ PEX. That’s an 8 on our check.
SharkBite doesn’t publish flow data for the adapter, a 5. The body is C69300 lead-free DZR silicon brass, listed to ASTM F1807 and F877 and NSF/ANSI/CAN 61 and 372.
The Amazon listing is a 10-pack sold by Amazon.com, with 7 left on Oct 22, 2026. The fitting in the photo is stamped Cash Acme, which RWC sells alongside SharkBite. Ignore the listing’s line about threaded connections; this one is sweat.
SharkBite certifies it for drinking water and hydronic heating, and the line comes in 3/4 in. (UC606LF) and 1 in. (UC605LF). The spec sheet says to use it with SharkBite crimp or clamp rings, sold separately.
My call: solder the cup onto the copper first, let it cool, then crimp the PEX. Keep the torch off the PEX.
Best for Uponor PEX-A expansion
Uponor ProPEX LF4515050
Uponor LF4515050 ProPEX LF brass sweat adapter, 1/2 in. PEX x 1/2 in. copper, bag of 25
25-year transferable warranty on the Uponor system
Cons
Made for Uponor AquaPEX or Wirsbo hePEX
Needs an expansion tool and ProPEX rings
Torch on the copper side; no solder within 18 in. of ProPEX
Bag of 25 from a third-party seller
1/2 in. PEX x 1/2 in.ProPEX x sweat100 psi at 180°F160 psi at 73°FCv 5.7ASTM F1960
Buy it if
Your house is plumbed in Uponor PEX-A with ProPEX rings, and you need to tie it into copper.
Skip it if
Your PEX is crimped or you don’t own an expansion tool. Use one of the SharkBites.
Uponor’s LF4515050 is the sweat adapter for Uponor’s PEX-A system, and I’ve used it. Uponor says its sweat adapters transition Uponor PEX tubing to copper pipe for potable water, residential fire safety and radiant systems.
The PEX end is a ProPEX expansion barb. You expand the pipe and a ProPEX ring, slide it on, and it shrinks back. Uponor says that’s why the joint can’t be dry fit.
The listing says to use it with Uponor AquaPEX or Wirsbo hePEX only, so PEX it accepts scored a 5. That’s the trade for a system built around one maker’s pipe.
The copper end gets soldered, a 7 on the copper-side joint. Uponor’s rule: do not solder within 18 in. of ProPEX fittings.
Uponor rates it 160 psi at 73°F, 100 psi at 180°F and 80 psi at 200°F, an 8 on rating when hot. For domestic hot water and recirculation, Uponor says not to exceed 140°F at 80 psi, per ASTM F2023.
It’s the only pick with flow data: Cv 5.7 and 2 ft of equivalent length, a 10. Uponor also says the adapters are safe for direct burial in soil.
The warranty is 25 years, transferable, on Uponor PEX pipe with ProPEX fittings, so it scored an 8 on our check.
The listing is a bag of 25 sold by eFaucets, with 3 left on Oct 22, 2026. It’s the most adapters per listing here.
Uponor lists it under the UPC, IPC, IRC and IMC codes, with IAPMO-ES and ICC-ES listings. The same adapter family runs from 3/8 x 1/2 in. up to 3 x 3 in., and ProPEX rings are sold separately.
My call: sweat the copper end first, with the PEX not yet attached, and keep 18 in. between your flame and any ProPEX joint already made.
The three side by side
Ends, ratings and warranty from SharkBite’s and Uponor’s own pages and sheets.
From SharkBite’s Max coupling page, Max spec sheet and install instructions, SharkBite’s crimp female sweat adapter page and crimp spec sheet, the RWC warranty, and Uponor’s LF4515050 page, submittal and FAQ, read Oct 22, 2026.
Which adapter fits your two pipes
Start with the PEX side, because the connection system decides the adapter. Then match the copper side.
Your PEX is joined with…
Copper side
Adapter type
Pick
Copper crimp rings (ASTM F1807)
Open pipe end you can solder
Crimp x female sweat
SharkBite UC600LF
Stainless cinch or clamp rings
Open pipe end you can solder
Crimp x female sweat
SharkBite UC600LF
Uponor ProPEX expansion rings
Open pipe end you can solder
ProPEX x sweat
Uponor LF4515050
Any PEX made to ASTM F876
Open pipe end, no torch allowed
Push both ends
SharkBite Max UR008A
Any PEX made to ASTM F876
Line that won’t drain dry
Push both ends
SharkBite Max UR008A
Not sure what system it is
Any
Push both ends
SharkBite Max UR008A (my call)
Look at an existing PEX joint to tell the system apart. Copper crimp rings are a plain copper band; cinch clamps are stainless with a tab; ProPEX rings are a thicker PEX ring pushed onto the fitting. The pipe is usually printed with its maker and standard, too.
My call: if the house has Uponor pipe and you own the expansion tool, stay in that system. If not, the push coupling is the one that works with whatever you find.
Pressure ratings at each temperature
Each maker publishes its ratings a little differently. Here they are on one table.
Pick
Cold (about 73°F)
180°F
200°F
Source
SharkBite Max UR008A
400 psi max
400 psi max
400 psi on copper
SharkBite Max spec sheet, install instructions
SharkBite UC600LF
160 psi at 73.4°F
100 psi
80 psi
SharkBite crimp spec sheet
Uponor LF4515050
160 psi at 73°F
100 psi
80 psi
Uponor submittal
A house runs nowhere near those limits most of the time, but the hot side and a recirculation loop are where they matter. Uponor says domestic hot water and recirculation shouldn’t exceed 140°F at 80 psi, per ASTM F2023.
SharkBite adds that on PEX, PVC, CPVC, PE-RT or HDPE, you use the pipe’s own rating rather than the fitting’s. The weaker of the two always wins.
Torch rules and order of work
PEX and push fittings don’t like flame. Each maker says how to keep the torch away.
Pick
Maker’s rule
Source
SharkBite Max UR008A
Make all solder joints first, then the SharkBite connections; don’t use flame close to a Max fitting
SharkBite Max install instructions
Uponor LF4515050
Do not solder within 18 in. of ProPEX fittings
Uponor submittal
SharkBite UC600LF
Sweat the female end onto copper; join PEX with crimp or clamp rings
SharkBite product page
Any sweat adapter
Sweat the copper first, let it cool, then make the PEX joint
My call
For the solder joint itself, follow the Copper Development Association’s steps: cut square, ream, clean with sand cloth, flux right away, heat and feed solder. Our emery cloth guide and solder and flux guide cover the supplies.
My call: wrap a wet rag around the copper between the joint and the PEX side when space is tight. It’s cheap insurance against heat creeping along the pipe.
The types of copper to PEX adapters
Every copper to PEX adapter is one PEX connection on one end and one copper connection on the other.
PEX end
Copper end
Tools
Example
Push-to-connect
Push-to-connect
Pipe cutter, deburr and depth gauge
SharkBite Max UR008A
Crimp or clamp barb (ASTM F1807)
Female sweat (over the pipe)
Torch, plus crimp or clamp tool
SharkBite UC600LF
Crimp or clamp barb
Male sweat (into a fitting)
Torch, plus crimp or clamp tool
SharkBite male sweat adapter
Expansion barb (ASTM F1960)
Sweat
Torch, plus expansion tool
Uponor LF4515050
Any of the above
Threaded (NPT)
Thread sealant
Not covered here
Female and male matter on the copper side. SharkBite says to sweat a female adapter onto copper pipe and a male adapter into a copper fitting. Pick the one that matches what’s sticking out of the wall.
All three picks are lead-free brass, listed for drinking water. Here’s what each maker states.
Pick
Body
Seals and rings
Drinking-water listings
SharkBite Max UR008A
Lead-free DZR brass
EPDM O-ring, 304 stainless retainer, 316 stainless grab ring
NSF/ANSI/CAN 61 and 372, NSF/ANSI 14
SharkBite UC600LF
C69300 lead-free DZR silicon brass
Copper crimp or stainless clamp ring (separate)
NSF/ANSI/CAN 61 and 372, NSF/ANSI 14
Uponor LF4515050
LF brass
ProPEX ring (separate)
NSF/ANSI/CAN 61 and 372, NSF/ANSI 14
DZR means dezincification resistant: brass made to hold up where some water leaches zinc out of ordinary brass. NSF/ANSI/CAN 372 is the lead-content standard, and 61 covers health effects for drinking-water parts.
The rings are sold separately for both sweat adapters. Uponor says to use the appropriate ProPEX rings, and SharkBite says to use its crimp or clamp rings for its warranty.
How to connect copper to PEX with an adapter
The push coupling has the fewest steps. These come from SharkBite’s install instructions and the CDA handbook.
Step
Push coupling (SharkBite Max)
Sweat adapter (SharkBite crimp or Uponor)
1. Shut off and drain
Wet lines are OK, per SharkBite
Drain fully; water stops solder from flowing (my call)
2. Cut
Cut square, remove rough edges and debris
Cut square, ream to full inside diameter
3. Prepare
Mark the 1 in. insertion depth on each pipe
Clean the copper and the cup with sand cloth, then flux
4. Join copper
Push the copper to the tube stop
Sweat the adapter onto the copper; let it cool
5. Join PEX
Push the PEX to the tube stop
Crimp, clamp or expand the PEX onto the barb
6. Check
Depth mark within 0.005 in. of the release collar
Check rings with a go/no-go gauge if crimped (my call)
7. Test
Pressure test right away, per SharkBite
Turn on and look for drips
SharkBite also says to leave at least 1 in. between Max fittings for removal. Our SharkBite removal guide covers taking one off.
Do you lose water pressure going from copper to PEX?
The adapter is one small restriction in a long run. Here’s what the makers publish about flow.
Pick
Flow figure
Source
Uponor LF4515050
Cv 5.7; equivalent length 2 ft
Uponor page and submittal
SharkBite Max UR008A
No tube liner needed for PEX; no Cv published
SharkBite Max page
SharkBite UC600LF
No Cv or equivalent length published
SharkBite crimp spec sheet
Equivalent length means the adapter costs about as much pressure as 2 ft of straight pipe, per Uponor. On a 40 ft run to a fixture, that’s 5% more length (our math).
My call: one adapter won’t change what you feel at the tap. A long run of undersized pipe will, so keep the PEX the same nominal size as the copper you’re leaving. See PEX vs copper vs CPVC for the pipe choice itself.
Keep the copper bonded when you add PEX
Copper water pipe often carries the house’s electrical bonding. A PEX section breaks that path.
Point
Detail
Source
SharkBite’s rule
When connecting a SharkBite Max fitting to copper piping, install a copper jumper cable to ensure proper grounding
SharkBite Max install instructions
Why it matters
PEX doesn’t conduct, so a PEX gap in copper can break a bond
My call
Who checks it
If you’re unsure what the copper is bonded to, have an electrician look
My call
My call: this is the step most DIY repipes skip. A jumper clamped to the copper on each side of the PEX section keeps the copper continuous.
Adapters we checked and left out
These came up in Amazon searches on Oct 22, 2026. Here’s what kept each off the list.
1/2 in. crimp or expansion sweat adapters in packs
Little-known brands, listing text only
Otoolling, WHK, PLUMBINGMASTER press x PEX
Copper press to PEX crimp adapters
Little-known brands; needs a press tool
Apollo APXMS12 barb x male sweat
1/2 in., 10-pack
1 left, third-party seller
Viega PureFlow crimp x copper 46644
3/4 in., 25-pack
No 1/2 in. listing found
SharkBite UAB600LF
Expansion x female NPT
Threaded, not a copper sweat end
How to choose in four questions
Question
If yes
If no
Is a torch off the table where you’re working?
SharkBite Max UR008A
Keep going
Is your PEX Uponor with ProPEX rings?
Uponor LF4515050
Keep going
Is your PEX crimped or clamped?
SharkBite UC600LF
SharkBite Max UR008A
Are you doing many joints in a repipe?
A pack: UC600LF (10) or LF4515050 (25)
One SharkBite Max
My call for most repairs: the SharkBite Max. For a planned repipe in crimp PEX, the UC600LF pack, soldered on before the walls close. Compare push fittings more widely in our push-to-connect fittings guide.
Questions people ask
What is the best copper to PEX adapter?
The SharkBite Max UR008A, on our spec score of 9.0. It pushes onto copper and any PEX made to ASTM F876, needs no torch, and SharkBite rates it to 400 psi at 200°F on copper.
Can you connect copper to PEX?
Yes, with a transition fitting. SharkBite’s Max coupling joins copper and PEX in any combination, and SharkBite and Uponor both sell sweat adapters that solder to copper on one end and take PEX on the other.
How do you connect copper to PEX using an adapter?
With a push coupling, cut both pipes square, mark the insertion depth and push each into the fitting. With a sweat adapter, solder the adapter to the copper first, let it cool, then crimp, clamp or expand the PEX onto the barb.
What are the different types of copper to PEX adapters?
Push-to-connect on both ends, crimp or clamp barb with a female or male sweat end, and expansion barb with a sweat end. Threaded adapters also exist for NPT fittings.
What are copper to PEX adapters made of?
All three picks are lead-free brass. SharkBite uses DZR brass, C69300 silicon brass for its crimp line, and Uponor uses LF brass, all listed to NSF/ANSI/CAN 61 and 372.
What are the advantages of a push copper to PEX adapter?
No torch, no crimp tool and no glue. SharkBite says the Max can go on wet lines and be pressure tested right away, and it’s approved behind walls with no access panel.
Do you lose water pressure going from copper to PEX?
Very little from the adapter. Uponor publishes a 2 ft equivalent length for its 1/2 in. sweat adapter. My call: keep the PEX the same nominal size as the copper.
Can you solder near PEX?
Keep the flame away. Uponor says not to solder within 18 in. of ProPEX fittings, and SharkBite says to make all solder joints before the push connections.
Do I need a jumper wire when going from copper to PEX?
SharkBite says to install a copper jumper cable when connecting a SharkBite Max to copper piping, to ensure proper grounding. My call: have an electrician check if you’re unsure.
Can a SharkBite go behind a wall?
The Max can. SharkBite approves Max push couplings behind the wall with no access panels, and underground when wrapped in its silicone tape. It says no joints within a slab.
Do Uponor adapters work with other PEX?
The listing says to use the LF4515050 with Uponor AquaPEX or Wirsbo hePEX pipe only, and Uponor’s 25-year warranty covers its pipe with ProPEX fittings.
Is PEX-A better than PEX-B for this?
Either works with the right adapter. SharkBite says PEX letter designations are not related to any rating system; the joining method is what decides the adapter. See our PEX-A vs PEX-B guide.
How we picked these
Why trust me
I’m Isaac Daniels, a licensed journeyman plumber in Georgia (license #JP507711), and I’ve used all three picks. Every spec here comes from SharkBite’s and Uponor’s own pages, spec sheets, instructions and warranties, read Oct 22, 2026. Where I add advice of my own, it’s labeled as my call.
How I pick
Only 1/2 in. copper to PEX adapters from well-documented brands, new and in stock on Amazon, checked through Amazon’s product data the same day.
Facts from each maker’s page, sheet or warranty first. Where only the brand-written listing says something, the page says so.
Each card’s spec score comes from the five checks below. All three score 7.0 or higher.
CPSC recall search for SharkBite, Uponor and Cash Acme: no recalls of these fittings.
The spec score, check by check
Each check scores 0 to 10 and counts one fifth. It’s our score from maker documents, not a customer rating or a lab test of our own.
Check (weight)
How it’s scored
PEX it accepts (⅕)
10 when the maker lists any PEX made to ASTM F876; 5 when limited to its own PEX
Copper-side joint (⅕)
10 for push with no flame; 7 for a soldered sweat joint
Warranty (⅕)
10 for 25 years with any listed pipe; 8 for 25 years only with the maker’s own PEX; 5 when none is stated
Rating when hot (⅕)
10 for 160 psi or more at 180°F or hotter; 8 for 100 psi; 5 when not published
Flow data (⅕)
10 when the maker publishes a Cv or equivalent length; 5 when not
Total
Average of the checks, to one decimal
Pick
PEX it accepts
Copper-side joint
Warranty
Rating when hot
Flow data
Score
SharkBite Max UR008A
10 (F876 PEX)
10 (push)
10 (25 yr, copper, PEX, CPVC)
10 (400 psi)
5 (none)
9.0
SharkBite UC600LF
10 (all PEX)
7 (sweat)
8 (25 yr with SharkBite PEX)
8 (100 psi at 180°F)
5 (none)
7.6
Uponor LF4515050
5 (Uponor PEX)
7 (sweat)
8 (25 yr, Uponor system)
8 (100 psi at 180°F)
10 (Cv 5.7)
7.6
Sources
SharkBite, Max Push Coupling product page (UR008A), SharkBite Max Fittings Spec Sheet and SharkBite Max Installation Instructions (2024-07): read Oct 22, 2026.
