Questions tagged [drain-waste-vent]

A drain waste vent is used to allow drain water to flow freely by permitting air the enter the system, usually through a vent stack or an air admittance valve. Use with the [plumbing] tag

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1 answer
33 views

Can I run 2 separate stacks for each group?

I am wanting to run 2 separate stacks. One for second floor bathroom and one for first floor bathroom. Both stacks will tie in together in the basement where the main line runs around the house then ...
1 vote
2 answers
59 views

Removing Glued-On Stub Out

I am replacing my two-bin sink with a one-bin sink. As a result, the garbage disposal is now resting on the tip/edge of this angle stub out that is glued on to the waste drain. I was good up to this ...
2 votes
1 answer
62 views

Two P-Traps on Single Vent?

I am replacing the old washing machine drain stand pipe, p-trap and clean-out. I am adding a utility sink to the garage laundry area washing machine vent stack. Am I creating a possible issue by ...
1 vote
2 answers
636 views

Is it safe to remove vent and cap off unused drain

I am in the process of renovating my kitchen and removed a wall. I discovered a closed off drain and a vent that goes through the ceiling. There does not appear to be anything else tied into the vent. ...
2 votes
1 answer
87 views

Why there is a wye under a pedestal?

Is there a reason why the builder used a wye under the pedestal with one end capped with a mechanical cap. The P-Trap is located under the floor. I’m replacing the pedestal with a vanity. Do I need ...
-1 votes
1 answer
55 views

1970’s ABS OD Pipe Size is Larger

We have a 1974 condo with some lateral 2” ABS schedule 40 pipe. Strange, but current fittings with hubs do not fit the old pipe. It’s as if the older pipe is just “slightly” larger than the current 2....
1 vote
1 answer
25 views

Can I connect a vent pipe from a defunct waste drain to a different, active waste drain pipe instead?

My goal is to remove as much defunct plumbing as possible. My scenario is: Former sink in basement (removed), drains to septic under slab Current sink in kitchen, drains to septic through long pipes ...
18 votes
9 answers
92k views

What can I do about my drains constantly getting blocked?

The one thing I have tried to do about this is use those foaming and non-foaming drain unblockers regularly. That has just been money down the drain, pardon the pun. I suspect that unblockers only ...
3 votes
3 answers
3k views

Manifold all vent pipes in attic to have one pipe into roof

I'm building a new house, 2 1/2 baths, laundry room & kitchen. What size vent pipe would be needed to manifold all vents into one?
5 votes
2 answers
35k views

Should a kitchen sink S-trap be replaced?

Everything I see mentions P-traps. I seem to have instead an S-trap. What are the downsides of this, and is it something that should be fixed?
0 votes
0 answers
23 views

Septic tank TLC (Europe)

We are getting some odors; at least partly from our septic tank. We purchased the house a year ago; and don't have any detailed plumbing schematics. So trying to work out what is currently happening; ...
1 vote
2 answers
8k views

Purpose of septic vents both in the yard and also through the roof?

My house has both septic venting that goes up through the roof and also a vent in the yard. What is the need for the yard vent? Is this vent a requirement (code or otherwise)? A "best practice&...
0 votes
1 answer
40 views

How High For A Condensate Standpipe?

I have a new Navien NPE-240A2 condensing tankless water heater that I'm installing in an existing small water heater cabinet accessible from the exterior of my house. The current tankless is an older ...
0 votes
1 answer
225 views

Reverse osmosis water saddle doesn't fit waste pipe

The reverse osmosis filters waste clamp (40mm) doesnt fit on my waste pipe (50mm) I ordered a 6mm compression fitting to use an npt taper The compression fitting took 3 weeks to arrive and I'm trying ...
0 votes
0 answers
39 views

Fiberglass Shower Drain Removal

1974 Condo on a post tension concrete slab. This was an original fiberglass shower enclosure. I can’t figure out how to remove this drain. Any advice is appreciated.
2 votes
0 answers
62 views

How far can you move the toilet away from the vent stack in NJ?

I plan on moving the toilet bowl to a different spot in the bathroom, further away from the stack. What is the maximum horizontal distance? Is it 9 feet? As per New Jersey Plumbing Code 2018, 12.8.4: ...
0 votes
2 answers
37 views

Trap layout for double vanity with existing stack

Installing a double vanity with 4" stack on one side. Typical in-wall double rough-in means drilling two-inch holes in multiple studs across an old exterior wall already hacked up by generations ...
0 votes
0 answers
40 views

Covering/closing a basement drain, any reversible options?

For a new basement-level room, we have the option of installing a drain or not installing a drain. We're not sure yet what we want to do with the space. It makes sense to have a drain installed while ...
0 votes
1 answer
525 views

How should I terminate water heater drain pan?

I have a water heater drain pan installed and I'd like to terminate it as close to code as is possible. The pan/water heater is currently in a closet that barely fits the pan. So unfortunately, there ...
0 votes
0 answers
41 views

Ok to use dishwasher connector for A/C condensate line?

Shown is an A/C condensate line from the floor above, that is connected to a cast iron stack via some method that probably isn't play dough but definitely isn't correct. The whole stack is being ...
4 votes
4 answers
188k views

When does an under the sink P-Trap assembly need venting?

In the realm of second homeowner woes, I had a P-Trap assembly under the bathroom sink. It was a straight connection to the pipe connected to the main sewer line. (least I think that was the case). It ...
0 votes
0 answers
48 views

Will this plumbing venting plan work?

Would this drain layout work for my basement bathroom in terms of sufficient venting and drainage? I have a dry vent available from above near the lavatory which I plan to use for venting the toilet ...
0 votes
2 answers
66 views

Washing machine drainage leaking - new appliance

I have a new washing machine (there wasn't one there before as I've recently moved in). When the machine is running the water spouts out particularly through a vertical 'vent' hose leaving a small ...
4 votes
1 answer
129 views

What is the composition of this 1940s era main drain line?

I have a main drain line running from my 1940s era single family residence in Las Vegas, NV to the city sewer. Given the time period I had assumed it would be cast iron, but when I dug down to it, it ...
1 vote
3 answers
487 views

Why does one of my bathroom sinks drain slowly when the water is running, but drains quickly when filled and drained?

One of my bathroom sinks drains slowly with the water running ( like when brushing your teeth ) but drains quite quickly if I plug the sink, fill it all the way, and release the drain plug. When the ...
7 votes
2 answers
30k views

New Vanity: Sink Won't Drain Completely

My wife and I just replaced the vanity in our bathroom. To fit the new sink, we had to cut some new PVC. Here's a picture. All the plumbing works, without leaks, except that it will not drain ...
0 votes
2 answers
111 views

Should PVC DVW landscape pipe be glued?

I'm re-routing a section of 4" landscape drain. "Triple-wall" pipe was initially installed and has been pinched almost completely closed by a nearby tree, so I'm installing Sch 40 DWV ...
2 votes
1 answer
173 views

Is this elbow coming from toilet a suitable fixture for DWV?

I had new plumbing installed and someone told me the elbow used under my toilet is incorrect. The company says it's fine. I'm trying to determine who is right. Here is the fitting: The manufacturer ...
1 vote
1 answer
127 views

Lower the point of drain attachment to a vent and adding a Studor (AAV)

I have a negative pitch in the drain pipe coming out of my sink drain that attaches directly to the vent stack. The vent stack is mostly inaccessible at the height of the p-trap though inside the sink ...
2 votes
1 answer
163 views

How do I re-route my main plumbing stack to make room for in-the-wall taps?

We're in the middle of renovating our upstairs bathroom. My lovely and amazing wife has bought two vessel sinks and in-wall mounted faucets. After removing the drywall we have sorrowfully discovered ...
11 votes
3 answers
54k views

Can I vent my bathroom exhaust fan into a plumbing drain vent?

I installed a bathroom fan in the ceiling. My bathroom is in the room right next to the laundry room. The washing machine has the standard drain pipe vent of a pvc pipe venting to the outside ...
3 votes
2 answers
320 views

Is there any filter or material that let only water through not dirt

I need a filter or some kind of cloth material which only lets water through and not the dirt this way I can get filtered water and I can soak it through french drain or dry well. I just couldn't find ...
0 votes
1 answer
225 views

Can I run a wet vent vertically between two floors?

On each floor I have a tub and a sink back-to-back with a 2x6 wall in between. Can I run a single 2" pipe as a wet vent from below the slab to the two fixtures, then up the wall to the second ...
3 votes
1 answer
298 views

Will Air Admittance Valves help me? If so, where to place them?

This is my first question so apologies if its not the highest quality. will do better over time. My primary question is: based on the current plumbing layout, what problems am I likely to experience, ...
2 votes
2 answers
771 views

Venting Plumbing AFTER drywall is up

First, some set up: My friends and I have been building a sort of Mancave over the last year. It's about 300 square feet, with a height of about 14 feet -- half of the place has a loft (making ...
4 votes
2 answers
2k views

Repairing leaking DWV vertical 3" thin wall PVC

While painting, my wife discovered some mold on top of the baseboards, and being curious I investigated. What I found pulling the baseboards is they were covered in black mold on the backside, as well ...
1 vote
0 answers
63 views

connecting p-trap to female galvanized tee

This may be a simple problem, but I'm not so knowledgeable about this section of the drainage system specifics. So, I have a bathroom sink with PVC trap, and I replaced the popup assembly. The pipes ...
1 vote
1 answer
4k views

Is this a proper wet vent?

I have mocked up a bathroom remodel waste line. It is the white pvc in the image. The toilet is 93" away from the stack and is the most downstream fixture. I think I did everything right but I'm still ...
1 vote
1 answer
70 views

Which of these options is the safest/most efficient method to plumb a kitchen sink drain in an island?

First, I'm going to try and describe the current (original/builder) configuration. It seems more complicated than it needs to be, but perhaps there's a reason or code that is required. This is a ...
2 votes
1 answer
204 views

Can a plumbing vent go up a different drain, for some length

My contractor came up with the below idea. Is it OK? The first floor kitchen drain vent can't exit directly anymore (there's an extra room being built on top). He tells me it can tap into the drain ...
-1 votes
2 answers
124 views

How to tell if lightly clogged shower drain has a venting problem?

I have a shower drain that was snaked a few months ago and has started having a very light back up again. After maybe 5 seconds of unenthusiastic plunger work, it clears up just fine. But come back an ...
0 votes
0 answers
34 views

Help with new install of small bathroom in basement?

I'm installing a brand new bathroom in my basement! I'm a DIYer, so after lots of learning, I'm looking for some experienced advice with the layout. I've only done remodels, not new installs. I'm ...
-1 votes
1 answer
114 views

Adding drain to existing system

I'm looking to add a drain line for a new water softener to my existing drainage system. It happens that where I'd like to install the new drain is right on the other side of the wall from an existing ...
1 vote
0 answers
111 views

Attaching flexible bath drain pipe to dwv pvc pipe

The drain pipe in the image below came with a bathtub I bought. How is it supposed to attach to regular dwv pvc? The inner diameter is about 1.375 inches, although at the two grooves near the end the ...
1 vote
0 answers
39 views

Need safe practice info for a very tight space waste drain problem

Please bear with me, as I am no plumber, beyond being able to sweat copper pipe, and glue PVC successfully. Thanks, in advance, for any help you can offer! Here's the simplest version of my question: ...
-1 votes
1 answer
3k views

PVC drain pipe that the washer empties into is echoing all plumbing sounds

My father said that we could put tape around the washer hose to lessen the gap between the hose and the pipe. I've found some adapters that go from the ~1" washer hose to our 2" pipe. My father said ...
0 votes
1 answer
229 views

Sound of water running after bath taps turned off

When running a bath, for the duration of my bath I hear water running/heavy trickling coming from the drain away holes at the top of the bath drain. This has got louder and stronger over the last few ...
0 votes
1 answer
45 views

New Kitchen sink poor drainage

After installing a new sink water backs up too quickly. If I remove the whole construction and pour directly into the sewer line it flows fine, so no line clog. I think I did mistake in positioning p-...
3 votes
3 answers
16k views

Can a tub and shower share the same drain?

Can a shower and tub share the same drain?
1 vote
1 answer
143 views

Weir to vent distance and venting options - IPC 2015

I have a new bathroom which plumbs the shower into the main stack via a 2” PVC pipe. My understanding is that the distance from the trap weir to a (in this case wet) vent can be up to 8”. My shower ...

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