For a P-trap replacement, match the size first: bathroom sinks take a 1-1/4-inch trap and kitchen sinks a 1-1/2-inch trap, the minimum trap sizes in the International Plumbing Code. Under a cabinet, a white plastic P-trap kit is the right replacement because it never corrodes and the slip joints go together by hand; use a chrome trap only where the plumbing shows.
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The P-trap is the curved pipe section under your sink that holds water to block sewer gases. When it cracks, corrodes, or develops a slow leak, the fix is a replacement that takes about 15 minutes, usually with no tools. I’ve replaced plenty of P-traps. Here’s what to buy and how to do it right.
| Product | Best For |
|---|---|
| JB Products P-Trap Kit (PVC) | Best Overall |
| PROFLO PFPTB100 Chrome P-Trap | Best for Exposed Plumbing |
| Dearborn P9703WBG 1-1/2 in. P-Trap | Best Basic Replacement |
Best OverallEditor’s Choice
JB Products PVC P-Trap Kit
polypropylene/PVC plastic · 1-1/2 in with included 1-1/4 in reducing washer · slip-joint + solvent-weld compatible · includes trap adapter, nuts & washers · reversible J-bend
Check the JB Products PVC P-Trap Kit on Amazon →
For under-sink drain lines hidden inside a cabinet, a white PVC P-trap is the standard professional choice. PVC doesn’t corrode, and the slip-joint connections don’t require tools. This kit ships as a complete set — J-bend, wall arm, PVC Marvel adapter, three ribbed nuts and three washers — so nothing else is needed for a standard swap. If your cabinet needs a longer run to the wall, an extension tube is a separate part.
- ✅ No corrosion ever
- ✅ Hand-tighten slip joints — no tools
- ✅ Complete kit — J-bend, wall arm, adapter, nuts and washers
- ✅ Fits 1-1/2 in and, with the reducing washer, 1-1/4 in drains
- ❌ Not aesthetic — white plastic only
- The polypropylene body resists corrosion and chemical drain cleaners better than thin chrome tubing.
- It ships with the reducing washer, nuts and trap adapter, so it fits both 1-1/2 in and 1-1/4 in drains out of the box.
- The reversible J-bend lets you orient the trap arm left or right to match an off-center drain.
- White plastic looks utilitarian on exposed under-sink plumbing where the trap is visible.
- Hand-tightened slip nuts can weep if over- or under-torqued, so they may need a re-check after install.
- It is a basic tubular kit, not a deep-seal or waterless-valve trap.
Verdict: Best for the typical kitchen or bath sink replacement where you want a corrosion-resistant, fits-everything kit.
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Best for Exposed Plumbing
PROFLO PFPTB100 Chrome P-Trap
17-gauge brass, chrome finish · 1-1/4 in x 1-1/4 in slip-joint tubular connections (standard bath-sink size) · high box flange included · no cleanout · for exposed bath drains
Check the PROFLO PFPTB100 Chrome P-Trap on Amazon →
If your drain lines are visible — a pedestal sink, a vessel sink, or any bathroom where the plumbing shows — a chrome P-trap is the right call. The PROFLO PFPTB100 is listed as a 17-gauge brass trap in chrome with 1-1/4-inch slip-joint connections on both ends, the standard bath-sink size, and it comes with a high box flange to trim the wall opening.
- ✅ Chrome finish for drains that show
- ✅ 17-gauge brass, heavier than 22-gauge tubular
- ✅ High box flange included
- ❌ 1-1/4 in only — a kitchen sink needs 1-1/2 in
- The chrome finish looks clean on exposed pedestal-sink and wall-mount installs.
- The listing gives 17-gauge brass, a heavier wall than thin 22-gauge tubular traps.
- Slip-joint connections let you loosen, adjust and re-seat the trap without cutting or cement.
- It is 1-1/4 in on both ends, so it is a bath-sink trap, not a kitchen one.
- The listing names no cleanout, so clearing it means loosening the slip nuts.
- Metal slip joints can seize over time, making future removal harder than on plastic.
Verdict: Best for exposed bath-sink plumbing where the trap is on show and you want heavier brass under the chrome.
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Best Basic Replacement
Dearborn P9703WBG 1-1/2 in. P-Trap
1-1/2 in. P-trap · threaded PVC adapter · reversible J-bend · True Blue washer included · full-wing slip nuts on longer threads
Check the Dearborn P9703WBG P-Trap on Amazon →
The Dearborn P9703WBG is the plain 1-1/2″ trap on its own rather than a full kit: the J-bend, a threaded PVC adapter and a True Blue washer. The J-bend is reversible, so the trap arm can face left or right to meet an off-center stub-out without buying a second part. Its slip nuts are the full-wing type on longer threads, which is what lets you get them hand-tight in a cramped cabinet without reaching for pliers.
- ✅ Reversible J-bend — arm faces left or right
- ✅ Threaded PVC adapter and True Blue washer included
- ✅ Full-wing slip nuts on longer threads, easy to hand-tighten
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How to Replace a P-Trap
- Put a bucket under the existing P-trap.
- Loosen the slip-joint nuts by hand (or with slip-joint pliers if stuck). The trap will drop and water will spill — that’s normal.
- Note the drain arm angle going into the wall — you’ll need to match this with the new arm.
- Assemble the new trap: attach the trap arm to the wall stub-out first, then connect the curved trap section to the drain tailpiece from the sink.
- Hand-tighten all slip-joint nuts — snug plus a quarter turn. Do not overtighten plastic.
- Run water and check all joints for leaks.
Plumber’s tip: Slip-joint plastic nuts should never be wrench-tightened — you’ll crack them. Hand-tight plus a quarter turn is enough. If it leaks, check that the washer is seated correctly before adding more torque.
What Is the Best P-Trap?
There is no single best P-trap; there is the right material for where it sits. PVC for anything inside a cabinet, because it shrugs off drain cleaner and corrosion. Chrome-plated brass where the trap is on show. Either way, match the size to the tailpiece and use new washers. A reversible J-bend lets the arm face an off-center stub-out.
FAQ
What size P-trap do I need?
Most bathroom sinks use 1-1/4″ drain lines. Most kitchen sinks use 1-1/2″. Measure your drain tailpiece (the pipe coming down from the sink drain) to confirm before buying. Full table for every fixture: trap sizes by fixture.
Why does my P-trap smell even after cleaning?
If a drain isn’t used regularly, the water in the P-trap evaporates and sewer gases come through. Run water for 30 seconds to refill the trap. If it still smells after that, the trap may be cracked — replace it. If a trap that is used regularly keeps going dry, the arm is probably too far from the vent and siphoning — see how far a trap can be from the vent. If the trap turns straight down into the floor instead of sideways, that is an S-trap — a different fault, and a prohibited one.
Can I use PVC and ABS fittings together?
Use transition cement or transition couplings when joining PVC and ABS. Don’t use standard PVC cement on ABS or vice versa — it won’t bond properly. Full breakdown: PVC vs ABS pipe, including the transition coupling inspectors actually accept.
What is the best P-trap for a bathroom sink?
A 1-1/4-inch trap — the minimum trap size the International Plumbing Code gives a lavatory. If the trap hides in a vanity, the JB Products kit above fits it with the included 1-1/4-inch reducing washer; if it shows under a pedestal or wall-mount sink, the PROFLO PFPTB100 is 17-gauge chrome brass with 1-1/4-inch slip joints on both ends.
What is the best P-trap for a kitchen sink?
A 1-1/2-inch trap, which is the code minimum for a domestic kitchen sink, with or without a disposer or dishwasher. The JB Products kit is 1-1/2 inch as supplied and comes with the J-bend, wall arm and adapter; the Dearborn P9703WBG is the 1-1/2-inch trap on its own with a threaded PVC adapter if you only need to replace the bend.
Bottom Line
For hidden under-sink drain lines, the white PVC P-trap kit is the right call. For exposed plumbing in a bathroom, use the chrome PROFLO trap. Either way, this is a 15-minute fix that eliminates a sewer gas leak and that slow drip under your sink.
If the clog keeps coming back after a clean trap, the blockage is further down the line and no amount of trap work will reach it — that’s drain machine territory.
Chasing a leak rather than a planned swap? See kitchen sink leaking underneath to pinpoint whether it’s the trap, a slip nut, or the supply side.
Related: PVC joints want primer and ABS does not — see is purple primer required.
Related: a trap only seals while it holds water — on a floor drain that needs help, see trap primers.
Related: chrome slip nuts mark and plastic ones crack — see gripping trap nuts without wrecking them.