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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 $10–$20 replacement that takes 15 minutes with no tools. I’ve replaced hundreds of P-traps. Here’s what to buy and how to do it right.
| Product | Best For | Price |
|---|---|---|
| Plumb Works P-Trap Kit (PVC) | Best Overall | ~$10 |
| LASCO 03-4342 Chrome P-Trap | Best for Exposed Plumbing | ~$18 |
| Oatey 38552 P-Trap with Arm | Best Complete Kit | ~$12 |
Best Overall: Plumb Works PVC P-Trap Kit
For under-sink drain lines hidden inside a cabinet, a white PVC P-trap is the standard professional choice. PVC doesn’t corrode, the slip-joint connections don’t require tools, and it costs under $10. Most kits include the trap and a drain extension arm in multiple lengths so you can configure for your specific cabinet depth and drain location.
- ✅ No corrosion ever
- ✅ Hand-tighten slip joints — no tools
- ✅ Includes multiple extension pieces
- ✅ Under $10
- ❌ Not aesthetic — white plastic only
Best for Exposed Plumbing: LASCO Chrome P-Trap
If your drain lines are visible — a pedestal sink, a vessel sink, or any bathroom where the plumbing shows — chrome P-traps are the right call. The polished chrome finish matches standard drain trim and looks clean. LASCO’s chrome trap uses durable brass construction with a chrome plating that holds up in wet environments.
- ✅ Polished chrome — looks professional
- ✅ Brass construction under the chrome
- ✅ Matches standard chrome drain trim
- ❌ Costs more than PVC
Best Complete Kit: Oatey 38552
The Oatey kit includes the P-trap, a drain arm, extension pieces, and slip-joint washers — everything you need in one purchase. Useful for a full drain reassembly after cleaning a clog or replacing a drain basket, where you want all fresh parts.
- ✅ Everything included — no separate purchases
- ✅ Fresh washers prevent leaks
- ✅ Works for 1-1/4″ and 1-1/2″ drain openings
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.
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.
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.
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.
Bottom Line
For hidden under-sink drain lines, the white PVC P-trap kit at $10 is the right call. For exposed plumbing in a nice bathroom, spend $18 on the chrome LASCO. Either way, this is a 15-minute fix that eliminates a sewer gas leak and that slow drip under your sink.