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 for heavy-duty water connections. They’re not interchangeable. Here’s exactly what to buy and when to use it.
| Product | Best For | Price |
|---|---|---|
| Oatey 31403 White PTFE Tape | Best for Water Lines | ~$4 |
| Harvey’s Yellow Gas Line Tape | Best for Gas Lines | ~$5 |
| Oatey Pink Monster PTFE Tape | Best Heavy Duty | ~$6 |
Best for Water Lines: Oatey 31403 White PTFE Tape
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 for gas lines
Best for Gas Lines: Harvey’s Yellow Gas Line PTFE Tape
Yellow PTFE tape is thicker and denser than white, specifically formulated for gas line connections. The color coding is intentional — visual confirmation the correct tape was used. Never use white tape on gas lines: it’s thinner, less chemically resistant to gas compounds, and not rated for that application. Important: gas supply line work requires a licensed plumber in most jurisdictions.
- ✅ Correct tape for all gas connections
- ✅ Thicker and denser than white
- ✅ Color-coded yellow for identification
- ✅ Chemically resistant to gas compounds
Best Heavy Duty: Oatey Pink Monster PTFE Tape
Pink tape is 3–4x thicker than standard white. Designed for oversized fittings, older corroded galvanized threads, or any connection where standard tape keeps leaking. I keep a roll for stubborn connections where white tape isn’t giving me a seal.
- ✅ 3–4x thicker than standard
- ✅ Seals damaged or oversized threads
- ✅ Fewer wraps needed
- ❌ Too bulky for tight small fittings
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 tape, 2 wraps for 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.
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 — $4, lasts years, handles all standard water connections. Add yellow tape if you have gas appliances. Pink Monster tape for stubborn older fittings. Right tape for the right job, and most threaded leaks are a 5-minute fix.