Installing a new vanity, and like idiots, we forgot to account for a floating cabinet when plumbing hookups went in, so the drain outlets have about 3-4 inches clearance below, but there’s plenty of space otherwise. The plan is actually to try some waterless valve traps anyway, but if we don’t like them, or there’s some future inspection issue, can it simply be sloped up at a 1/4 -1/2 in grade? Maybe also with some bends to save space?
My plumber comes to install in a few days, and I’d like to know how much of an idiot he’ll call me
Would not recommend that RV trap. Will get very funked up on hand sink with toothpaste and hand soap. Slope doesn’t matter much on such a small run. If your pushing the arm up you are adding more pitch which won’t hurt especially if solids are not running down it.
Can’t really understand where your clearance issue is. But it sounds like the outlet at the wall is to close to the base of the cabinet? If so u can try to modify the cabinet base/ cut a hole for the bottom shelf to make room for the trap. If the outlet is too high for the base of the sink you could try a low inlet trap. Otherwise if you have room for extra fittings you can 90/ elbow up right at the wall and then 90 back out for your trap.
Or just jam that shit up at an angle. The problem will come when that cocks the trap at an angle that you cant get a tight connection onto the tailpiece coming down of the popup on the sink. Don’t recommend slinky pipes but its not my house so do what you want.
The wall hookups is too close to the cabinet bottom, and there’s not enough room for the U. I’d prefer not to cut a hole in it if possible.
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