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Questions tagged [p-trap]

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

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Where is the best place to cut and rebuild my bathroom drain pipe?

I am remodeling my bathroom. I'm at the point of fitting the drain in. They glued all the PVC together up to the ABS. Where would be a good place to cut? I've marked in the photo where I am thinking,...
Mr. Jintendo's user avatar
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1 answer
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I'm replacing a bathroom faucet drain, but the p-trap has no nuts + trap arm is leaking

I'm replacing a few bathroom faucets, and when I went to replace the drain with the provided drain assembly, I realized that the p-trap was missing nuts to remove the j-bend from the p-trap assembly. ...
leukenta's user avatar
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refill trap in drain for heat pump condensate

Bad smell in laundry room. We have a clear plastic condensate drain (D) from air handler (for heat pump) in attic. In the laundry room, D is visible in the wall opening that holds the water pipes for ...
Catherine's user avatar
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Is it possible to make garbage disposal drainage pipe longer without effecting P-Trap?

I am installing a water filtration system under my kitchen sink. The filtration system requires a small drainage line to be drilled into the vertical drainage pipe from my disposal to the P-Trap (See ...
Neal's user avatar
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Does My Garbage Disposal Outlet Need to Be Higher than This Drain Pipe?

I'm going to install a new sink in my kitchen island. The attached picture shows what the plumbing looks like with the old, shallow sink. My new sink is 3" deeper than this one in the picture. So,...
George Witte's user avatar
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1 answer
163 views

Can a P-trap turn backwards?

We are gutting and rebuilding our basement, and part of that included removing an improperly installed shower and replacing it with a bathtub. However, in order to position the tub so it fits in the ...
techturtle's user avatar
2 votes
1 answer
163 views

Kitchen sink slow drainage and P-Trap installation

Please see attached picture. I used a combination of flex and fixed pipes under the kitchen sink. Please note that the level of U or P-trap is higher than the drain in the wall. Is this configuration ...
sankhla's user avatar
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I'm plumbing up a tiny house and the homeowner bought a gravity flush RV toilet, does it need a ptrap under it? [closed]

Thanks in advance for your assistance! So I've never installed an RV style toilet, and I can see that when you push the pedal it's a straight shot down the drain, and I don't know if it holds water in ...
Robert's user avatar
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2 answers
419 views

Can I cap one of two drain lines under my kitchen sink?

My kitchen sink is a double, and I wanted to convert it to a single. However, pretty much every guide I find shows that most doubles use the same p trap, while my sink has a separate p trap and wall ...
Jimbob's user avatar
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Can I use a screw-together p-trap on a bathtub?

I want to install a P-trap that can be unscrewed is so I can quickly access the trap in hopes of catching anything that might fall in before it goes down to my sewer grinder and damages it. The only ...
Carmel5512's user avatar
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Connecting polypropylene p-trap to drain

I'm really struggling here with what I think is actually a very simple problem. I am replacing my sink. I have a black plastic (poly, not PVC) 1.5" p-trap assembly that I wish to keep, because I ...
Taylor's user avatar
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Is this P trap and AAV configuration acceptable with regard to the dishwasher drain inlet?

Our new sink arrived and the position of the drain from the wall is higher than ideal. Because of this, I ordered a reversible P trap to accommodate the drain location elevation and also intend to ...
Chris's user avatar
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144 views

How to install a P-Trap with no offset and minimal horizontal travel

Hey professional plumbers (of which I am not). I am looking to replace the P-trap on a new kitchen sink install but I'm running into issues with the spacing for the p-trap. We are converting from a ...
Russ W.'s user avatar
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1 answer
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P-trap underfloor for stand alone dishwasher

I am installing plumbing for a dishwasher that is not near a sink. We already have a dishwasher that is intended to be installed free-standing. My plan was to install a washing machine box in the wall ...
yakatz's user avatar
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1 answer
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Tub drain p trap angle

Installing a new tub and needed to move the ptrap. Please let me know if the proposed angle poses any problems.
David Gilardi's user avatar
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Can I replace the swivel elbow of a p trap with a straight pipe

Can I replace the swivel part of a ptrap with a straight connection right into the drains of my two sink bowls? Basically like in the picture. The red line shows where the threaded swivel connection ...
bpdronkers's user avatar
1 vote
1 answer
135 views

Can I install a p-trap with AAV onto a horizontal sewer line?

I currently have a standpipe for a dryer (no p-trap and unvented) which connects (via some elbows) to a horizontal sewer line in the basement. I would like to (a) install a p-trap in the basement ...
divB's user avatar
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-1 votes
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Why are p-trap j-bends reversed depending on application?

Whenever I install P-traps under sinks (eg, usually inside a cabinet or the like, but outside of a wall, using threaded fittings), the asymmetrical J-bend has the straight side towards the drain and ...
tau's user avatar
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Bathroom Sink Plumbing

I installed a new countertop and sink in my 20 yr old home. The existing sink drain pipe is 1 1/2 and it appears to be a Street fitting but with an edge on it to retain a threaded ring. I have tried ...
RRsteele's user avatar
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My bathroom sink isn't aligned with the P-trap. Could that be causing the smell?

Total novice here. The sink in our bathroom often has a bad smell coming out of it. We've done bleach as well as baking soda & vinegar, but it seems to keep coming back. I noticed that the sink ...
orchest's user avatar
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What tools do I need to replace this rusted p trap

This sink is draining very slowly but this p trap seems rusted. What tools and part would I need to remove this? Tried pliers and nothing seems to budge.
scoot's user avatar
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4 votes
1 answer
3k views

Nightly overwhelming sewer gas smell from shower drain only while in use

Ok here is a doozy we have been dealing with for over a year. House was a new build 2012 and we had never had any plumbing issues until we had our roof replaced a bit over a year back and around the ...
ChrisF's user avatar
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2 answers
536 views

Smelling sewer gases from my washer

Our front-load washing machine has a problem where sometimes it really smells of sewer gas. This only happens occasionally, and we can only smell it when the door is open. We usually leave the door ...
David K's user avatar
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How to elongate IKEA sink downspout to reach P trap U pipe?

I inherited an IKEA sink and plumbing (boooo), and today I took it apart to clean it out due to clogging. Unfortunately, it is now leaking no matter how hard I try to put it back together. I believe ...
radlinsky's user avatar
3 votes
2 answers
72 views

Do I need to remove a laundry standpipe trap before using the pipes for a sink?

We are renovating our basement and adding a kitchenette. The kitchenette space used to be where the washer and dryer were, as you can tell by the water, lines and drain stand pipe. We plan on using ...
Landon's user avatar
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1 vote
2 answers
1k views

1-1/4 inch sink drain tailpiece into 2 inch p-trap in bathroom

TLDR - I want to replace a bathroom vanity that currently has a totally glued 2" p-trap (that is in good condition except for the oddness of the setup). Hoping I can use the p-trap as is by ...
wc8789's user avatar
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1 answer
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Can I remove it without destroying it - Glued P trap on clogged old laundry sink

It’s an old concrete laundry sink with a glued PVC p trap (I’m assuming) and it’s currently clogged. Snake isn’t hitting anything and isn’t making it through the p trap. It looks like there is a no ...
Jethro's user avatar
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1 vote
2 answers
574 views

Can the garbage disposal outlet be lower than the building drain inlet? [duplicate]

As shown in the diagram below, my kitchen sink garbage disposal has an outlet (#1 on diagram) which is about about half an inch lower than the inlet for the building drain pipe (#4 on diagram). Is ...
rfii's user avatar
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2 answers
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What type of trap adapter is needed to connect a brass tub drain to an ABS p-trap?

For a brass tub drain and overflow, how would one connect the brass tailpiece to transition to an ABS p-trap? The issue is that the brass pipes seem to have a different outer diameter compared to ABS ...
adatum's user avatar
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2 votes
1 answer
669 views

Can I have a short horizontal arm between shower drain and p-trap to avoid an obstacle under floor?

I am trying to fit a 2in shower p-trap between floors with 2x10 joists. Unfortunately, I have a run of EMT electrical conduit directly (about 8in) below the drain; and, as a result, a standard trap ...
Drew's user avatar
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0 answers
40 views

Double P Trap Unvented Under Slab

My kitchen sink has 2 p-traps that are unvented. One p-trap is under the kitchen sink, and the second is under the slab. What should I do? I am concerned about toxic sewage gas, not a slow drain. It ...
Chloe's user avatar
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0 votes
1 answer
299 views

Rusted kitchen basket strainer, mystery plumbing under the sink

This is existing under my kitchen sink; the basket strainer was completely rusted. The tailpiece looks different from any I've seen before and wasn't even tightened into the trap. It almost looks like ...
user167952's user avatar
2 votes
1 answer
114 views

Can I add a 2nd trap into existing with T for this cat fountain?

I am adding an automatic cat water fountain. The flow will be minimal, when this turns on by motion sensor. Can I connect this fountain into the existing plumbing between the trap and the wall with a ...
ttugates's user avatar
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5 votes
1 answer
6k views

Is P-Trap installed correctly? [duplicate]

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 ...
Connie W.'s user avatar
8 votes
3 answers
3k views

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 ...
Paulz's user avatar
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1 vote
1 answer
352 views

Is it ok to have just one big P trap at the outlet of building

My house doesn't have P trap for kitchen sinks/bathroom sinks etc.. So instead of placing a p trap for each. May I just place one big p trap where the water is discharged from the building to outside. ...
CuriousMan's user avatar
0 votes
1 answer
62 views

Finding the ptrap to unclog the kitchen sink

I am trying to unclog my kitchen drain and unsure if the black section in the first picture is the p-trap or not? I am trying to avoid opening up something that I should not be trying to open up. I ...
Rahul's user avatar
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0 votes
2 answers
4k views

Is my sink trap leaking because it's missing a seal?

I have absolutely no clue about plumbing so I apologize if any of the terms I use are wrong. My p-trap is leaking, the outlet side threads on to the pipe in to the wall, but the inlet side just pushes ...
user1234's user avatar
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2 votes
2 answers
1k views

P-Trap missing on laundry drain / sewer smell

I moved into a new home with laundry room in basement and started to notice occasional wafting of sewer gas out of the laundry drain pipe. It is an older home built ‘58. It looks like there is no p-...
user164651's user avatar
1 vote
2 answers
89 views

Installing Drain For Sink

in a utility room at my home there is the water line and sewage line capped off bc they were not being used. What I want to do is add a utility sink in this location. Cutting the water, cutting the ...
user2676140's user avatar
0 votes
0 answers
241 views

Can the standpipe for washer be relocated without moving ptrap?

In my area, the ptrap arm length (section between waste stack and ptrap) is limited to one foot per 1/4” of the pipe’s inner diameter. (at a 1/4” per foot slope) I want to move my washer a bit further ...
init_js's user avatar
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0 votes
0 answers
30 views

Sink gargle after draining or when flushing toilet

I have recently installed a new vanity but had to extend the trap back to the drain as it didn’t line up like it did before replacing the vanity. Before it never made noise when draining or flushing ...
Cody Erb's user avatar
1 vote
2 answers
667 views

Sink Trap Leak After Faucet Replacement

I just replaced my bathroom sink and added new faucet which came with drain kit. I can’t get the circled connector to stop leaking and it really feels like the new drain pipe is just too small to have ...
KathyJ's user avatar
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1 vote
1 answer
426 views

Basement Shower Drain Rough In

Our basement rough in for the shower drain has it located right where we want it, but it has no p-trap installed yet. I am unsure what I can do to add the p-trap but keep its location. I'm trying to ...
Joseph White's user avatar
7 votes
2 answers
1k views

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 ...
Guy's user avatar
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5 votes
3 answers
13k views

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 ...
Lukas D's user avatar
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1 vote
3 answers
7k views

Can I connect a plastic p-trap to metal pipes?

This is the current situation...(this is a an old cask iron slop sink that came with the house.) There was a leak and we thought it was the p-trap...so we decided to get a PVC one. The other pipes ...
milesmeow's user avatar
  • 5,072
0 votes
1 answer
131 views

How should I replace this jerry-rigged Trap?

The downstairs bathroom vanity in my 60s era house leaks, I am going to replace the entire vanity. This should be quite straightforward with the exception of the P Trap (pictured). The P Trap looks ...
Sam Coulter's user avatar
3 votes
1 answer
591 views

Raising p-trap that is too low in 2nd floor joist

I removed a large light structure from my 1990s kitchen ceiling in order to install canless led lights and learned the p-trap from the shower in the floor above rests 5" below the joists ...
Dan M's user avatar
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0 votes
1 answer
2k views

How best to brig old Pex water lines up to code / safety

My house in in western New York state. I'm trying to deal with the hack job that the previous owner or flipper did on my house with respect to the water supply lines in the kitchen (hot to sink, cold ...
THill3's user avatar
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