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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1answer
56 views

Bathroom p-trap 2in male to 1 1/4 in drain outlet

I am trying to replace pipes and trap in my bathroom sink. For some reason the drain is connected via a 2in male threaded pvc pipe. On the other end I have a "standard" 1 1/4in metal pipe (...
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Does sealing an apartment floor trap cause clogs in the main drain line?

There was a waste water leak initially from the top of P-trap that belongs to our neighbour upstairs. When the handyman came to seal the gaps, they knocked the pipes and the sounds made from the main ...
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2answers
204 views

Leaky p trap, no bevel at connection point

The p trap in my kitchen sink started leaking at the rear connection point. When I unscrewed it to see what was going on, there was no bevel on either end of the connection. I don’t know how the seal ...
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38 views

What is this white hard build up on my rest room basin trap?

Someone please tell me what is this build up ? Why is it build up outside of pipe ? There is no leaking and no hole.. The greenish i suppose is copper (that means this trap has got some copper in it)? ...
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1answer
98 views

Can I use a 90 degree elbow between the tail pipe of bathroom sink and the trap?

I live in a large Travel Trailer and would like to have more space beneath the sink for storage. I'm buying a top mount rectangular vessel sink with hand pressed pop up drain plug no mechanism from ...
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3k views

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 ...
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121 views

installing a P-trap for the washing machine with this layout, will it convert to S-trap or causing problem?

Because there is a badly smell from the pipe and I have just learnt that it is probably due to lacking of trap. Here is my kitchen pipe. The waste output is shared with the dish washing sink. The ...
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1answer
39 views

Combining (dry) vents for fewer roof penetrations

I am remodeling and in the process need to move part of the vent stack. A simplified sketch of my existing plumbing situation across multiple floors is shown (pencil). I am proposing to eliminate vent ...
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1answer
100 views

AC drip pan not draining until p-trap cap is opened

We had our AC replaced and have been having some issues. Currently it seems like the drip pan isn't draining until I pop open one of the clean out ports on the higher level on the p-trap that was ...
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1answer
48 views

Installing a Reverse Osmosis (RO) system under sink, should the feed connection go after or before the dishwasher connection?

Not sure if it matters, but do I connect the RO systems feed water connection before or after the dishwasher feed water connection. Also, where’s the best place to put the drain saddle?
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Slip Joint Reducer Washer too thick / Nut too thin

I've been trying to replace a corroded bathroom sink drain. From my wall I have a 1 1/2" threaded PVC or plastic pipe. I have been attempting to attach this to the elbow from my p-trap kit using ...
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90 views

Plumbing a modified S/P Trap? With a Vent on the ‘P’?

I have a couple plumbing questions. I’m adding in a washing machine and sink. My space is tight and in the right bay where the Sink Drain is above is an electric panel. The part out of the wall I was ...
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1answer
46 views

Removed old vanity and installed new vanity and there is limited space to install new P-trap

As noted, I have installed the new vanity, and the space between the new sink drain and the wall is very limited (4.5 inches to center of the new sink drain). I thought I could just go on the other ...
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30 views

Smell from laundry drain, possibly no vent?

Just purchased a home that was renovated. Appears to have not been by a professional, nothing major but small things. Not sure what to do on this one. There is a smell coming from the in wall drain....
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352 views

P-Trap into Wall Marvel Connector Leaking

I discovered a leak under my bathroom sink. There are two sinks in the bathroom with the same plumbing set up and only the one side is leaking. The water is coming from the marvel connector on the ...
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2answers
660 views

Can I use horizontal 90 degree elbows to run a p trap along a wall?

Off center vent stack (see picture). Can I use a 90 degree elbow out of the vent stack, run drain pipe along the wall, and then another 90 degree elbow so that the p track will point directly ...
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1answer
2k views

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 ...
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1answer
261 views

Can an AAV be in a crawl space if the P trap is also in the crawl space?

I have a situation where the P trap to the washing machine is in the crawl space instead of in the wall. There is no vent. I thought about adding an Air Admittance Vent in the wall (see diagram--...
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1answer
134 views

Will a doubled P-trap cause problems if it has a vent between the traps?

Our plumber discovered that the drain pipe under our bathroom sink (which is done properly with a P-trap and vent) has a second P-trap down in the crawl space, which is incorrect. I've been ...
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1answer
62 views

Should I install a drain trap on the main pipe before it exits my home?

So my father-in-law and I are going back and forth.. I plan on redoing my entire main plumbing. When I purchased the house we remodeled the bathroom and had a plumber run a new schedule 40 stack and ...
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1answer
107 views

Double vanity shared P-Trap

I've seen a couple conflicting answers here for whether or not a second p=trap is necessary, my understanding is 30" is the max distance between drains to share a p-trap, which my vanity is. I ...
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1answer
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Installing bath sink draining for pedestal when drain does not line up

I have install a pedestal sink in my basement half bath. The drain pipe is perpendicular to the sink and the p-trap does not extend out far enough from the pedestal to allow for connecting. What are ...
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1answer
717 views

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 ...
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2answers
373 views

What kind of j-trap will fit this pipe?

The quarter bend is threaded and has, at the threaded end, an exterior diameter of approximately 2.5" while the pipe itself is more like 2.375" OD, so I believe this is 2" PVC. It is ...
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99 views

Plumbing a 60inch double vanity with one or two p traps

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 ...
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1answer
214 views

HVAC Condensate Line P Trap

I've consistently experienced issues with my AC. I won't get into all of the background, but I would like to know if the pictured condensate line is appropriately trapped. The vertical PVC pipe is not ...
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1answer
368 views

Is this plumber's putty?

Is this giant mess made of plumber's putty, and if so, what can I expect to find behind it if I chisel (or Dremel) it off? It has a slow leak so I'd like to fix it, but I'm not sure what it is, and I'...
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148 views

New garbage disposal drain is a bit higher than stubout on wall

So I'm in a basement that is below the drain-level of the house, and there's a small kitchenette, bathroom, and thus a sump pump. I decided to in garbage disposal unit (there wasn't one before) in ...
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1answer
113 views

How to repair leak between P-trap arm and drain pipe

I recently replaced my bathroom faucet including the water supply lines and I now have a slow leak from the drain pipe/P-trap connection. I'm thinking I must have accidentally bumped the P-trap or ...
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2answers
275 views

Laundry drain smells like sewer after washing clothes

I have an in-wall laundry drain - pictured below. Since we moved in it had a significant clog which I unclogged with a combination of wet-vac sucking on the drain and snaking the vent pipe. Finally we ...
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1answer
299 views

P trap won't drain from water softener

I installed a water softener in a house we just moved into. I did a manual regen to test everything and nothing or at least very little drains past the P Trap and is pouring into the crawl space. I ...
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1k views

How do I plumb this kitchen sink to stop the leak and improve drainage

I'm trying to stop this setup from leaking and improve the drainage. The sink is a bit low, and the basket strainer drops a few inches. Below that, I have a tailpiece with a dishwasher connection, ...
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1answer
162 views

Is my sink trap too high?

Hello I renovated my kitchen and had plumbing moved and replaced. Didn’t really think about the height of the waste pipe before cabinets sink and countertop went in. With new sink and disposal ...
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1answer
116 views

What is the best way to rebuild this shower drain?

Converting a tub to a shower, and with the drain location changing I'm just getting back to the underbelly and seeing the alignment of things before hooking it all back up. You can see the new drain ...
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1answer
447 views

Is it possible to use ABS cement to glue together THREADED ABS union fitting on P-trap for permanent connection?

Is it possible to use ABS cement for threaded ABS union fitting on P-trap for permanent connection? Or it won't be secure enough even if it glued together with cement? Or need to actually replace with ...
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51 views

Sink drain piping, smelly and trap isn't dry

I recently installed a new sink and had to redo all the drain pipes. There is a pretty bad sewer gas smell coming from the drain. It is a kitchen sink so it gets used frequently. I checked the trap ...
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1answer
430 views

How can I get the sink trap to clear the drawer under my bathroom sink?

Is there a better solution to a P-Trap? We have installed a new vanity only to find that the drawer contacts the p-trap. The vanity has 3 drawers. The top one is built in a "u-shape" and ...
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2answers
3k views

Drain making dripping sound after sink drains. No leaks

Does anyone have an idea why after I turn off the water in my newly installed vanity, it begins making a dripping noise for approximately 5-15 seconds. It's only a few drips honestly but none of the ...
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1answer
462 views

What's the maximum allowable height between a shower drain and the trap?

Is there a maximum height from my shower drain to the top of the trap (the length of the tailpipe)? I am aware after the trap there must be a 1/4" per ft slope and the vent must be within 60"...
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1answer
367 views

p-trap installation by newbie: cement cure time

I was installing a new p-trap under the kitchen sink: Attached tailpiece to the sink no problem. Then I prepared a short piece of 1 1/2" ABS pipe, put a plumbing cement on it, inserted one end ...
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1answer
296 views

apply plumbing cement on p-trap

Is it mandatory/recommended to apply cement on all threaded parts of a P-trap. I need to install a new one, and am wondering if I also need to get a plumbing cement. Also, if I purchase a P-trap with ...
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2answers
667 views

How to make the P-Trap sloped

I am remodeling my kitchen, and am completely redoing the drain system because I have to move it over. I am looking online, and it seems that the part after the P trap to the vertical part of the ...
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62 views

Water leaking from sink trap

This weekend I replaced a drain stopper and all the hardware down to the p-trap, keeping those parts original. After connecting everything I ran the water for about 10-15 minutes while I cleaned up. ...
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1answer
281 views

Can I add a sink drain to a stack serving the floor above?

A local plumbing company (big name) said that anything draining from upstairs would suck my p-trap dry. I asked about the mechanical vents, and he said it would not work. He went on to tell me that ...
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1answer
116 views

Could this trap be siphoning?

I've attached a picture of the trap for my washer. The closet that this is in smells like septic tank gas so I assume it is leaking out of the standpipe. I haven't seen this type of trap before and I'...
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1answer
108 views

Can I make my own p-trap

I am doing some plumbing in a country where p-traps for showers are not readily available. The local option is not viable for me, and ordering p-traps online would take some time. Is there any reason ...
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127 views

Why is this Ptrap installed in this location?

Here is a recent installation done to my home I took this one before i drained the water: Note that this a p-trap that is installed at the external wall of my house. It would be in line with the p-...
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1answer
182 views

Question about drain trap - limited space in cabinet

I am finishing my basement bathroom and have run in to a drain spacing issue in my vanity. The PVC coming out of the wall is 20" off the floor. The bottom of the vanity cabinet is 18" off the floor, ...
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1answer
440 views

Can I drain two clothes washers into a shared two-inch pipe?

I am installing a second washing machine in a different part of the house and want to connect the two washers to the same drain(2 inch pipe). The current washer is in the basement with basic setup of ...
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1answer
749 views

Pipe from wall too low to go into vanity

As you can see by the photo my pipe from the wall is too low to enter the back of the vanity. How can I fix this without cutting the drywall?