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Teflon tape — technically PTFE thread seal tape — is in every plumber’s toolbox, but most homeowners buy the wrong kind or use it incorrectly. White tape is for water lines. Yellow tape is for gas. Pink tape is a water-line grade Oatey also lists for plastic threads. They’re not interchangeable. Here’s exactly what to buy and when to use it.
| Product | Best For | Price tier |
|---|---|---|
| Oatey 31199 White PTFE Tape | Best for Water Lines | Lowest |
| Harvey’s Yellow Gas Line Tape | Best for Gas Lines | Mid |
| Oatey 31402D Pink PTFE Tape | Best for Plastic Threads | Highest |
Best for Water Lines: Oatey 31199 White PTFE Tape
Check the Oatey 31199 White PTFE Tape price on Amazon →
White PTFE tape is the standard for water supply connections — faucet supply lines, hose bibb adapters, shower arms, toilet supply connections. Oatey is one of the most trusted names in plumbing. Consistent thickness, tears cleanly. Two to three wraps clockwise around the male threads is all you need — more isn’t better and can prevent the fitting from threading fully.
- ✅ Standard for all water supply connections
- ✅ Consistent thickness — no thin spots
- ✅ Tears cleanly by hand
- ✅ Available everywhere
- ❌ Not the tape for fuel-gas threads — codes want yellow
White PTFE tape · standard density · for water supply threads
- The standard for every water-supply thread — faucet lines, shower arms, hose bibbs
- Consistent thickness and tears clean off the roll
- Trusted plumbing brand you will find in any supply house
- Codes want yellow gas-line tape on fuel-gas threads, not white
- Does nothing on compression or slip-joint fittings
- Over-wrapping actually prevents a good seal — 2–3 wraps is plenty
Verdict: The white tape to keep on the truck for every water connection.
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Best for Gas Lines: Harvey’s Yellow Gas Line PTFE Tape
Check the Harvey’s Yellow Gas Line PTFE price on Amazon →
Yellow PTFE tape is made specifically for gas line connections, and the color coding is intentional — visual confirmation the correct tape was used. Put yellow on gas threads because that is what the code and the inspector expect, not because white tape is chemically weaker: Oatey, which makes both of these tapes, says to use yellow tape for gas applications when required by code. Important: gas supply line work requires a licensed plumber in most jurisdictions.
- ✅ The tape codes call for on gas connections
- ✅ Yellow gas-line PTFE — Harvey lists it as meeting Federal Specification T-27730A
- ✅ Color-coded yellow for identification
- ✅ Chemically resistant to gas compounds
Yellow PTFE tape · Harvey lists Fed. Spec. T-27730A · rated for fuel gas
- Gas-rated yellow PTFE made for fuel-gas threaded joints
- Yellow color is visual proof the correct tape was used
- Rated for natural gas, propane and butane lines
- Overkill on ordinary water lines
- Gas work often needs a licensed pro and a permit
- Still pair with approved pipe dope where local code requires it
Verdict: The tape to put on gas threads — yellow is what the code and the inspector are looking for.
If your threads are nicked or worn, paste beats film — see the pipe dope picks.
Best for Plastic Threads: Oatey 31402D Pink PTFE Tape
Check the Oatey 31402D Pink PTFE Tape price on Amazon →
Pink tape is not thicker than white — Oatey lists both at 3 mils. Being listed for plastic is not the difference either — Oatey lists the white 31199 for “plastic, brass, copper, aluminum, galvanized steel or black iron piping” as well. What actually differs is density: Oatey lists the pink at 1.20-1.50 grams per cubic centimeter against 0.709 to 0.825 for the white, on each roll’s own Oatey technical specification sheet.
The spec numbers look like a second difference and they are not one — Oatey lists the pink as complying with MIL-T-27730A, a military specification the Defense Logistics Agency’s standardization record shows was cancelled in 1998 and superseded by A-A-58092, which Oatey lists for the white roll on its product page — and Oatey’s technical specification sheet for that same white roll claims T-27730A as well, so both rolls carry the same paperwork.
The temperature range is not a difference either — Oatey’s specification sheets give both rolls -450 to 500 degrees F. Reach for the pink when you want the denser roll, not for extra bulk or a different spec, because there is neither.
- ✅ Denser roll at the same 3 mils — Oatey lists it at 1.20-1.50 g/cc
- ✅ Temperature rated from -450 to 500 degrees F — the same range Oatey gives the white roll
- ✅ Listed by Oatey for metal or plastic threaded piping up to 1-1/2 in.
- ❌ No thicker than white tape — Oatey lists both at 3 mils
Water-line PTFE · 3 mils, same as white · 1.20-1.50 g/cc vs 0.709-0.825 for white · MIL-T-27730A, same as white
- Oatey lists it for metal or plastic threaded piping up to 1-1/2 in.
- Rated from -450 to 500 degrees F, the same range Oatey gives the white roll
- Denser tape resists tearing while you wrap
- No thicker than white tape — both are listed at 3 mils
- Costs more than standard white tape
- Not a substitute for gas-rated tape on gas lines
Verdict: Worth reaching for when you want the denser roll — not for extra thickness, because there is none, and not for the spec, because Oatey claims T-27730A for the white roll too.
How to Apply Teflon Tape Correctly
- Start at the first thread and wrap clockwise (when looking at the end of the fitting). This ensures tape tightens rather than unwraps as you thread the fitting.
- Overlap each wrap by about half the tape width as you move toward the end of the threads.
- Apply 2–3 wraps for white or pink tape.
- Press tape into threads with your thumb so it seats into the grooves.
- Tear and press the end flat. Thread the fitting immediately.
Plumber’s tip: If a connection leaks after applying tape, don’t add more tape on top. Remove the fitting completely, clean the threads, and start fresh. Layering tape over a leak rarely works.
Tape is not always the right sealant. Threaded plastic, compression joints, and sink drains each want something different — Teflon tape vs pipe dope vs plumber’s putty lays out which one belongs on which joint.
FAQ
Can I use Teflon tape on compression fittings?
No — compression fittings seal via the ferrule compressing onto the pipe, not thread sealant. Using tape on compression fittings can prevent proper seating. Use tape only on tapered NPT pipe threads.
What’s the difference between PTFE tape and pipe dope?
Both seal threaded connections. Tape is cleaner, easier to use, and removable. Pipe dope provides a more robust seal and is preferred for larger diameter fittings and high-pressure applications. For most homeowner repairs, tape is fine.
Do I need tape on every threaded connection?
On tapered NPT threads, yes — always use tape or pipe dope. On straight threads that use a rubber washer to seal (like garden hoses), tape is not needed and may prevent the washer from seating properly.
Bottom Line
Keep Oatey white PTFE tape in your toolbox — cheap, lasts years, handles all standard water connections. Add yellow tape if you have gas appliances. Pink tape for stubborn older fittings. Right tape for the right job, and most threaded leaks are a 5-minute fix.
Related: tape belongs on tapered male threads and nowhere else — MIP, FIP and NPT explained.
For the plumbers reading this
Most of this site is written for homeowners — this page clearly isn’t. If you’re in the trade and want the occasional straight-shooting note when I publish something like this (fittings comparisons, tool tests, code changes), drop your email. No spam, no course funnel, written by a licensed GA journeyman.
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