Plumbing – Air Lock in Trap

A 1 1/4" female FIP adapter worked perfectly. As soon as I saw it, I was embarassed for not having thought of it earlier.

I used some teflon tape, screwed the FIP adapter onto the adapter coming out of the wall, then just glued my 1 1/4" pipe directly into it. No reduction in pipe sizes, and 100% ABS parts.

• As long as the p-trap is lower than the drainage from the basin then you can install it. It can also be lower than your exit pipe you need to drain into
• You attach the p-trap directly to the drainage and manuever the p-traps exits into you existing drain.
• It is not ideal to have the p-trap below the the exit drain because water gravity has to force the water out instead of it flowing downwards naturally. They both work and have seen it many times. But essentially anything below already creates its own p-trap- so using another is redundant.
• If the p-trap is to tricky just create your own loop from pvc
• For ease of manageability you can use a flexible waste connector pipe from the p-trap to your drain pipe.
  

Some twisted to fit p-trap

Small pcv p-trap

A sideways p-trap is useless, you might as well connect it straight line.

Theory of a p-trap

You might want to look into s-traps also