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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55 views

How should this sink be vented?

We are remodeling our kitchen and moving the sink from against a wall to a peninsula. You can see below what the plumber put in. The new sink drain is lower left (in blue). The drain eventually ...
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176 views

Water softener standpipe question

I have a 1 1/2 inch standpipe coming off of a 2 inch drain pipe in my basement. The only thing before the stand pipe is the kitchen sink. And after the standpipe is a pipe coming down from the washing ...
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647 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 ...
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184 views

What's so bad about single stack DWV systems?

We're in a region which allows single stack DWV installations in multi-storey buildings. In other words, a single large-diameter vertical pipe that serves as both discharge stack and vent for several ...
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19 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 ...
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37 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 ...
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30 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: ...
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1answer
128 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. ...
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61 views

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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35 views

Is this wet venting solution ok?

I am completely redoing my basement bathroom and am wondering if this way of venting the plumbing is ok. From what I've seen, wet venting is the most money and time efficient way to do it, so I would ...
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96 views

Plumbing plan for freestanding tub

remodeling my master bath (3rd floor), replacing the old acrylic shower/tub unit with a clawfoot tub. Want to make sure I'm doing the plumbing correctly. Tub outline (roughly) in black. Plumbing ...
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203 views

Proper use of a side inlet elbow in bathroom DWV situation

I'm renovating a 2nd floor bathroom in a 95 year old house. I'm not changing the layout much except for replacing the existing standard toilet with a wall toilet and slightly changing the location of ...
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35 views

What is the proper and best way to drain and vent this bathroom?

The green lines are existing vent for shower. The black lines are proposed bathroom sink drain and p-trap. The red lines are option 1 for vent for bathroom sink. The blue lines are option 2 for vent ...
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32 views

Bathroom remodel DWV

I am in the middle of a bathroom remodel. At this point the final configuration will likely be determined by the drains and vents required for a free standing tub, toilet and sink. The existing ...
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83 views

Toilet and given vertical soil stack and no wall space behind

I'm planning out a new second floor bathroom in a historic home and I'm not finding many examples. The best placement for the soil stack is to come up directly under the toilet. The best place for ...
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192 views

Can a basement bathroom be vented through a stack servicing sinks on the floor above?

Can a basement bath (toilet, sink and shower) macerating pump system be workably (not codes) vented into a 3" PVC that vents out the roof if the 3" PVC vent pipe also has 2 vanity sinks on the floor ...
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88 views

What's the best way to protect plastic drain waste vent pipes from UV damage on a roof?

What is the best way to protect plastic plumbing waste vents (DWV) where they extend above the roof? PVC discolors and gets brittle in the sun, solid ABS gets chalky, foam cellular core ABS bends ...
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263 views

Under slab DWV lines

Just wanted a quick opinion on lay out for my under slab plumbing before I start gluing. Top left 4" pipe is for toilet (17" from each foundation wall, top right 2" is for the vanity. The P-Trap ...
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64 views

Can I vent a 3 inch ABS sewer line with a 2 inch pipe?

I will be attaching 1-1/2" vent line from 4 different fixtures (shower, tub, 2 sinks) in the unfinished ceiling above bathroom and also if I can still use it as my main soil stack (2 inch) to protrude ...
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623 views

Plumbing replacement - Drains, P-traps, and Vents

I'm having a bathroom remodel done that involves replacing the leaky old galvanized steel plumbing with PEX piping. I have zero plumbing experience, but I'm not convinced it's being done properly. ...
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67 views

Are these bends in the tub drain going to be an issue?

Im getting ready to run the drain for my basement bathroom but I'm concerned that I have too many turns in the tub drain. I had to start in the wrong direction in order to pick up a wall for a vent. ...
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2k views

Should I use a sanitary tee or a wye into a diagonal section of pipe?

I'm installing a temporary drain line for a kitchen sink while a remodel is taking place. The most convenient place for me to tie in the temporary line is into a section of 2" cast iron drain line ...
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127 views

Where are vents required for bathroom drains?

Here is a diagram of the new drain plumbing we are installing for one and a half new bathrooms. Where should I locate any required vents on these lines? I live in Oakland County, MI and it looks they ...
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106 views

Joist in the way of drain

I'm installing a replacement bathtub. Because a truss joist (3 1/2" wide & running lengthwise in the center of the tub) is in the way of the drain and overflow, I'm left to devise a bend in the ...
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270 views

Is this drain setup adequately vented?

Pictures are coming after I find new batteries for my mouse. My basement has two vertical drain pipes. Drain pipe number one comes down directly from my bathroom sink. Near the basement ceiling, a ...
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159 views

How to solve bad smell with p-trap near exit

I have a bad smell in the bathroom, sewer like smell. Just moved in, but pretty sure that the bath, the separate shower and washbasin all lead into the same pipe, which descends into the cellar and ...
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1k views

Drain / Vent Plumbing for Laundry box into existing piping

I have an existing drain set up like this: I am replacing the existing washer / dryer, and would like to set up the washing machine to drain into a proper laundry box (instead of draining into the ...
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127 views

Are drain-clearing bladders safe?

I advised a friend to use a drain bladder to clear a sink clog. Turns out there was a vent that didn't connect to the main vent stack--it just terminated inside the wall. So she put a bunch of water ...
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155 views

Why does the Hartell Reservoir style pump require no venting, while the Little Giant Drainosaur does?

Why does the Hartell Reservoir style pump require no venting, while the Little Giant Drainosaur does? See links below for more info on pumps Hartell Pump Little Giant I am having a hard time ...
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185 views

Would you trust this PVC drain joint?

This is a joint for a 2" elbow underneath a unit-shower (in Japan.) The elbow is a special type which is clear, and using a blue glue shows the glue line so you can insure you have a good joint. ...
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2k views

How can I connect dishwasher waste pipe to sink waste pipe?

I moved in recently in our new home and when we put the dishwasher on a gush of water appeared on the floor. I turned off the dishwasher and took a look under the sink to find the waste pipe was ...
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259 views

Is this the vent?

Below is an image below my kitchen. The drain for the sink. I can hear the water run through it Junction Connects to the 3" main drain Is this a vent? I don't hear any water going through it and I ...
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27 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 ...
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41 views

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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57 views

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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34 views

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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55 views

Basement Utility Sink Draining into Auxiliary Vent Stack

I want to install a utility sink in my basement. The problem is that the main sewer line is on the other side of the house and there is no way to run a pipe from where I want the sink to the main ...
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1answer
123 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 ...
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63 views

Can you wet vent a sink without dry vent for sink?

Is it possible to attach a sink to a wet vent setup without its own dry vent? I.E. I want to use the existing wet vent for the drainage but I don't want to run a new vent for the sink if I don't have ...
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28 views

New bathroom design - stack pipe

I am trying to add a new bathroom in the attic for kids. Here is idea 1, my doubt is that could I join the toilet drain into the laundry drain? Does that cause any issues like the smell? I am new to ...
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139 views

Wet Vent in Basement Bathroom

Finishing a bathroom downstairs where the rough waste lines already exist. I live in Michigan, my question is around venting. I have seen AAV's under sinks in this state before, but it looks like ...
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181 views

How many twists and turns can a vent pipe take?

I'm replacing a bathtub in the basement and by the looks of it, its trap is not vented. I want to know if I can put a vent pipe in the location I've identified as most feasible and secondly, if it's ...
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54 views

Need help roughing out DWV for new double sing location

I am trying to move a double sink vanity to the wall on the left where we closed in the closet door. This 1977 floor plan didn't make a lot of sense to us so we are doing a full remodel of the ...
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48 views

Basement Bath Drain/Vent Help

I'm finishing my basement, and adding a bath in the process. I'm hoping to get some help with drain/vent questions. The current stack is right in the middle of where the new shower will be. I'm moving ...
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83 views

Can I run a water line behind a stack vent?

I am attempting to move a hose bibb/spigot 10 feet horizontally (from in front of my driveway gate to behind it). The water line comes up from the foundation through a brick exterior wall. My plan was ...
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41 views

Is there a simple way to evaluate whether a vent stack is clogged?

I recently spoke with a home owner who has had a number of plumbing issues, ultimately resulting in a new sewer line run from the residence to the main. The homeowner is concerned that there may still ...
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1answer
344 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 ...
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230 views

Difficulty (drain plumbing wise) in splitting a large bathroom on the second floor into two bathrooms?

We have a large main bathroom and we'd like to split it so we have a small master bath and a smaller main bath. Layout wise, door wise, etc, we think it will fit but we're trying to gauge the ...
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317 views

DWV: Dirty arm with a tight bend on the end

This is a mock-up of a vanity drain rough-in on a 2-foot "dirty"/trap arm. Ideally the screw fitting that accepts the trap will sit as close to the wall as possible. Is there any reason for this to ...
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242 views

Fixing Shower Without P-Trap

I have a shower on the first floor that does not have a P-trap. A previous owner did some remodeling and the shower drain pipe is plumbed right into the top of the waste line with a tee. You can see ...