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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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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; ...
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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....
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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.
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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: ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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2 votes
1 answer
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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 ...
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2 answers
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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 ...
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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 ...
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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, ...
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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 ...
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2 votes
1 answer
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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 ...
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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 ...
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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 ...
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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 ...
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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: ...
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1 answer
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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 ...
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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-...
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2 answers
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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. ...
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1 vote
1 answer
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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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Moving washing machine from upstairs to the basement

I have a cabin that is in the mountains. When we bought the washing machine is upstairs and we would like to relocate it to the basement where the dryer is. What do we need to pump the water from ...
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Is this kind of connection for the dishwasher code compliant?

I was recently checking out the plumbing for my dishwasher and noticed an unusual drain setup. The dishwasher drain pipe feeds into a DWV pipe that is open at the top. Is this compliant with plumbing ...
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1 answer
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Should a plumber automatically choose to auger from the toilet? [closed]

I hired a plumber to clear a clog...toilet wouldnt flush, was bubbling, and water was backing into the shower and sink. He pulled the toilet and started the snake. When he first said he was going to ...
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How to install sink waste line with limited room between garbage disposal with an AAV required

Issue I'm trying to install the waste lines to attach my sink to the sewer line. This is complicated by my garbage disposal being directly in front of my wall hubs, forcing me to divert the lines ...
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1 vote
2 answers
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Toilet water drains out slowly after flush

My toilet flushes normally, but after the flush, the water drains out again slowly until the siphon suction breaks (this happens about 10-15 seconds after the flush). This doesn't always happen -- I'...
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2 votes
4 answers
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Can I Run Electrical Wire through sewage pipe/ vent

I'm trying to run new electrical wire from the basement to my 3rd floor apartment. There’s a cast iron vertical sewage pipe that goes in the exact route I’d like the wire to go. But there would be ...
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Wet Venting Combined Bathroom and Washing Machine

I am about to fully re-do the plumbing in my bathroom and could use some advice on my current layout. I am in a UPC region. This house has a single bath with drain lines in a crawlspace, single story ...
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Can a sanitary vent take a jog around an obstacle?

I have a sanitary stack running through a bathroom but enclosed by drywall. The enclosure takes up quite a bit of space in the bathroom but without it the stack would be visibly running through the ...
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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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Why does my toilet still get air bubbles?

Bubbles = bad ventilation, right? I've got a 1st story toilet which has air bubbles on every flush. It does not bubble after/before and water is not siphoned out/in when other plumbing is used. I'm ...
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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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2 votes
2 answers
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What is this pipe? It leaks when the sink runs

I have a pipe that is halfway under a door jamb and inside the concrete floor which when I run a the sink water is now coming out of it. This pipe is next to our AC blower unit inside the basement. I ...
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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 ...
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Plumbing DWV isometric drawing tool (free or <= $40)

I am attempting to learn how to draw isometric drawing for DWV. Does anyone have a recommendation of a good isometric drawing tool for Plumbing DWV? Software, website, etc? Free or <= $40.00 for ...
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1 vote
1 answer
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DWV: Clothes Washer and Utility Sink

I have been going through new houses under construction in my area to learn about Drain, Waste, and Venting (DWV). I found this configuration (reference image below) and it does not look to be correct....
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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 ...
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1 vote
1 answer
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What is the dry time where can you pressure test a DWV system after glueing?

I just pressure tested my system and found a leak in some old connections. So I removed them and added some piping. The dry time for use is 2 hours. Is it the same for pressure testing to 5psi?
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