Solvent Weld P-Trap Best Practice

[Bens]

When using these solvent welded p-traps is it considered good practice to introduce a threaded coupling between it and your sanitary tee for future maintainability ( repair, replacement, etc ) or are people fine solvent welding these directly to the roughed in drain line?

https://www.lowes.com/pd/Charlotte-...ia-PVC-Schedule-40-Hub-P-Trap-Fitting/3132661

 

[wwhitney]

What fixture is this trap for?

If it's a bath or a shower, typically they aren't accessible after installation, and so the best practice would be to use a fully solvent-welded trap, not one with a union in the middle. Certainly there's no point in using a union trap without a second reversible joint nearby to allow disassembly.

A 1-1/2" trap with a union in the middle could be used under a lav, with a trap adapter on the inlet side to adapt to the fixture tailpiece. But I think I prefer using a tubular trap, which puts the trap adapter on the trap arm. That would make rodding through the trap arm feasible by removing the trap.

Cheers, Wayne

 

[Sponsor]

 

[Bens]

It's for a sink - what you say about rodding is a good point.
I just dislike the PVC trap adapters horizontal - they always seem to leak very subtly when you're not looking...and the tube traps seem so flimsy.

Thanks!

 

[Reach4]

It's for a sink - what you say about rodding is a good point.
I just dislike the PVC trap adapters horizontal - they always seem to leak very subtly when you're not looking...and the tube traps seem so flimsy.

You can get 17 gauge brass slip joint p-traps. Not flimsy at all.