Compression Seal
Does every joint of a p-trap need to have a compression seal?
I installed a new sink that’s not draining properly – waiter backs up into the sink instead of flowing through the p-trap and into the waste pipe in the wall. There’s no blockage in the trap. I had to use an adapter to connect the p-trap to the wall – i’m wondering if every connection from the sink to the wall needs to be sealed with a compression nut, teflon tape, or caulk, perhaps to keep the pressure in the pipes such that water flows out. Is this the case?
What type adapter did you use? Is this the only difference in how the old piping was arranged? What size pipe, and what type material is the pipe protruding from the wall? I suspect that this is where your problem lies! Water drains by gravity, but it needs a vent, in order to drain properly. You might have stuck the drain pipe too far into the wall, just as the previous person said. If that is the case, disconnect and shorten the pipe that attaches to the wall pipe. Good luck!
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