There are a few reasons why someone might consider installing a double P-trap in their plumbing system. One reason could be to create a deeper seal against sewer gases and odors. By having two traps, there is an extra barrier preventing any unpleasant smells from entering the home.

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Mar 30, 2020 · A double trap is two plumbing traps in tandem, one after the other in line, and this often causes the first trap to get sucked out by the last trap. An example of one sink trap connected to another sink’s trap is shown above.

May 22, 2022 · A double kitchen sink requires only one trap to work fine, there is no need to have more than one P trap in multiple sinks. Sink water goes down to the drain with help of the Fixture arm and A P trap.

Jan 16, 2007 · Two traps are a solution to a specific problem and are normally only used when the pipe from the wall is too high for the one trap installation. Many inspectors will reject an installation with two traps connected to one opening.

Oct 30, 2012 · There now is a 2" pipe with a p-trap that ties into the main drain line and I want to connect onto that trap and extend it to the center of where the shower is going to be.

Dec 20, 2020 · Here is my layout. I have one drain on the right side of the vanity coming through the floor. If I come up to TEE WYE Going to The left sink with a pipe run that is 40 inches hooking to a p-trap then to The sink drain.

May 26, 2018 · Basically, there are two p-traps in sequential order, one small diameter and one larger close to the wall. I have attached a photo for reference. My understanding is that this is not acceptable, but that's as far as I get. My guess is that I remove the smaller P-trap and feed both sides of the sink into the larger one in the back; is this correct?

Feb 23, 2021 · I've been researching this and understand that having two in-line P-traps can cause drainage problems because air gets trapped between the two traps and water can't push it out. However, in this case, there is a vent between the two traps, so I think that particular problem may be ameliorated.

Since the new sink will have its own P trap right below the bowl, does it matter if there is a second P trap below the concrete somewhere? I assume that it wouldn't make any difference in operation of the sink if there were two P traps, but wanted to check.