A P-trap is an elbow inside a drain that is designed to hold water to prevent sewer gases from making it back up the sink. The trap then empties into the drain line at the wall, perpendicular to the sink drain (looking like the letter "P" turned face down). Use with the [plumbing] and [drain] tags
Questions tagged [p-trap]
114 questions
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2 answers
Is my p-trap installed correctly?
I just moved into a new house and am having a problem where the sink takes longer than normal to drain. Also, while using the shower, there is a gurgling from the sink.
I tried some drain cleaner, but these were supposed to be newly installed lines.…
Jon Moore
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Under sink has cylindrical fixture instead of J-pipe, what is it and how to clear it out?
Part of my problem is not knowing the names of what I'm referring to, so feel free to suggest title edits please.
A bathroom sink is draining very slowly after someone bearded shaved, despite them gathering most of the hair out of the sink. I…
cr0
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How long must the horizontal run be to make an S-trap a P-trap?
In this fantastic bit of MS Paint artistry, I've shown an S-trap and a P-trap. In my humble opinion, the only difference between them is the horizontal run between the top of the upflowing bit of pipe (defining the end of the trap itself) and the…
FreeMan
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Connecting a p-trap via bending the drain stem vs the trap arm?
I have a p-trap that has an outlet that ends too close to the wall for it to be able to be connected straight into the trap adapter of the vent inside the wall.
I'd like to avoid the non-code conforming flexible drains if at all possible. Although…
Tony DiNitto
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Is my sink P-trap too low?
Just put a new sink in and was not lucky enough to have the plumbing line up. I have it roughed in and wanted some insight/opinions on whether this will work, or what I need to do to fix it. I have a slope leading from the disposal to the trap, but…
Christopher Z
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3 answers
Alternative method for connecting sink drain with waste pipe directly under?
This seemed so much easier in my head before I started.
The sink drain is just about directly over the waste pipe. I glued this together with two 45s and a 2 to 1 1/2 wye. I need to connect an AAV to the top of the wye. The P trap doesn’t line up…
Paulz
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Transparent P-Trap to help diagnose smell issue is wrong size
What I've tried so far
I have this P-trap that I thought was standard. I bought a transparent replacement described as "Fits 1-1/2 in. or 1-1/4 in. ABS" but the fitting (reducing gasket) was too small. So I'm guessing that this is a non-standard…
Guy
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2 answers
How can I remove a cement-welded sink trap?
I could use some help figuring out how to remove the trap under my bathroom sink from the wall. It looks like all the connections from the trap are unthreaded connecting to the outlet/wall.
I've removed both the nut at the top of the p-trap and the…
Ramy
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1 answer
Can elbow fitting be used to line up drain tailpiece with trap
I installed a new vanity and the drain tailpipe does not line up with the P trap. Can I use two 90 degree elbow fittings to make this connect? Can elbows connect to elbows directly or does it require an extender in the middle? See the picture of my…
5
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Is P-Trap installed correctly?
Our bathroom sink is used multiple times per day but there is a bad odor almost every time we turn on the water, coming from p trap. We have found some bad DIY work in this house already, so I’m wondering if this trap is installed correctly.
Connie W.
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5
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3 answers
How do I adjust plumbing when converting a double kitchen sink to a single?
We will be installing a single under mount sink with garbage disposal. Converting from the current double basin sink.
I'd like to tackle this project if possible. My idea was to cap the right existing side, shorten the pipe coming out of the…
Lukas D
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5
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2 answers
Do I need water traps on my sinks with dry-well greywater collection?
My house has been fitted with water traps in toilet and bathrooms drains which is quite good, but I can see that my kitchen sink, washing machine outlet pipe and regular wash basin don't have water traps.
Shouldn't we have water traps to avoid gas…
Amogam
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5
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1 answer
Can I remove the Bottle Trap if I already have a P Trap?
I recently moved into a new flat and it has 2 sinks that are plumbed as such:
As far as I understand, both the Bottle Trap and the P Trap serve the same purpose, so in this case the Bottle Trap is redundant and can be removed, right?
I'm asking as…
Vlad Schnakovszki
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5
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2 answers
What is this coming off the drainpipe near the p trap?
A small repair is going on, but what is this other pipe coming off the drain pipe near the p-trap?
Boyd
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5
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How do I connect my sink to the drain in the wall?
I'm a real novice when it comes to plumbing. I've got a threaded 45 coming out of the wall (white pipe on the right) and an unthreaded black tailpiece coming down from the sink. How do I install a P-trap in this situation?
The new sink is…
Michael Mior
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