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A bap adaptor on the washer stand pipe just above the trap. It collects a little water every time the washer discharges water and sends it down a pipe connecting it to the floor drain bap adaptor. It isn't that hard to figure out. Gravity has worked in this application in four differen't states for me. The state inspectors prefer this method over a mechanical device.

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birddoggiest, those are only for the floor drain as far as i can tell and you still have to use a primer tied into the water supply line - - - - - - - PLUMBERS "Protecting The Health Of The Nation"

Hard water will do the same to a pin hole of a primer valve. That small hole in a bap adaptor is 1/2" OD. It worked great for years in the northern states. Texas might be different, you guys might have a lot of mean lint. I've heard everything is bigger in Texas....LOL

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The Stefani 20mm Dual Check Valve is designed to prevent cross contamination of non-potable water into safe drinking water. The two spring loaded check valves remain tightly closed until there is a demand for water downstream. In the event that there is reverse of flow direction, the check valves will close and back-flow is prevented.

Doing it like this takes a small amount of water from the discharge on the stand pipe and sends it to the tailpiece of the floor drain. It is a non mechanical method, UPC approved, and works great.

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There is a commonly referenced practice of doing this with a lav. I guess my question is if I could also do this with the washer discharge stand pipe. If the "supply" line from the washer stand pipe entered the drain tailpiece below the grate and above the trap, then gravity would do its job just like if the drain was collecting water off of the floor. Of course, if the floor drain became clogged in or lower than the trap, then there would be water on the floor.

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oh the only things that are pressurized. kinda dont sound right for the application if you ask me. can you post a picture of what you use at the standpipe and flushometer so i will know what they look like - - - - - - - PLUMBERS "Protecting The Health Of The Nation"

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still havent showed me what you use for a washer standpipe that will work properly and until you do i can only figure you have no clue as to what you are talking about - - - - - - - PLUMBERS "Protecting The Health Of The Nation"

Are you saying that water can not be captured in a bap adaptor glued into a trap and sent by gravity to a floor drain. If it is an approved method, "prefered" by the state inspectors in Wa. and Id. I don't see you arguement unless you just don't understand how it works. If that is the case then by virtue of high flow from the clothes washer, water backs up a little at the trap, a bap adaptor that was glued into it captures a small amount of water, and is transferred through a 1/2" OD copper tube by gravity to a bap adaptor above the floor drain trap. That small amount of water keeps the trap seal primed. I can't explain it any better than that. If you just don't agree that it works you should take it up with IAPMO, if they still use it there. It has worked fine for the 13 years I have done it this way, like I said in four different states and the inspectors prefer it particularly if hard water is a problem in the area. Simple and effective.

never seen this approved in the upc or the ipc. i do doubt that it is reliable enough because it doesnt take much to clog a little 1/2" opening with a washer drain. i mean come on it clogs 2" lines easy enough. but hey you say they are approved in your area so i say go for it i just classify that in a category with aav's and pex (my just not right plumbing category) - - - - - - - PLUMBERS "Protecting The Health Of The Nation"

never heard or seen it done on a washing machine standpipe ever. the lint will cover that little hole in a heartbeat making it as useless as airchambers - - - - - - - PLUMBERS "Protecting The Health Of The Nation"

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The Stefani 20mm Dual check valve provides protection in low hazard applications, like meter connections on domestic properties.

"We use a bap adaptor above the trap of the washer," i am still having trouble seeing how a drain line can push enough water down a pressure fitting especially with lint and soap ect. in the water - - - - - - - PLUMBERS "Protecting The Health Of The Nation"

they make a special tail piece for this application at a sink. they dont make one for a washer drain that i know of. not to mention the washer pumps the water out at a high volume compared to a sink - - - - - - - PLUMBERS "Protecting The Health Of The Nation" Edited 1 times.

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You can use a Bap adaptor on the washer standpipe tailpiece and also on the floor drain tail piece. I don't think you will find them at HD but the plumbing supply house can get them. They use a 1/2" OD pipe compression fitting. [#$%&]

dont know how you would connect it to where water doesnt end up on the floor but if you can think of a way then it should be ok - - - - - - - PLUMBERS "Protecting The Health Of The Nation"

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ok, so where is the picture for the primer piece that goes on a washing machine stand pipe? i know about, have seen, and used all of the stuff the code you posted said to use, but as i have been saying how do you connect it to the washer standpipe? you said that that and the flushometer are the only 2 places authorized in your area but you showed me a code saying only Fill Valves or Flushometer Valve Tailpiece Trap Primers. it says nothing about standpipe! oh and then you showed me a pic of a SINK tailpiece device - - - - - - - PLUMBERS "Protecting The Health Of The Nation"

Pressure fitting? It collects water as the clothes washer discharges into the stand pipe just above the trap (gravity). It is an approved and widely accepted method to prime a trap. It doesn't have any mechanical failiers or need to replace the trap primer valve when hard water or a small particals clog them up. The flushometer tailpiece works the same way. Here is a link from IAPMO [pld.iapmo.org] [www.jrsmith.com]

i know what they are but i have never seen one for a washer stand pipe. - - - - - - - PLUMBERS "Protecting The Health Of The Nation"

I like a non mechanical way to trap prime if possible. Laundry standpipe and flushometer tail piece is the only fixtures they let us do it with.

We use a bap adaptor above the trap of the washer, run a 1/2" line to a bap adaptor above the floor drain. For the toilet flushometer they make a special tailpiece that has a 3/8" compression adaptor on it that a supply tube connects to the trap primer in the floor. They only allow it on a fixture that has a large volume of discharge.

Could a laundry room floor drain be primed by using a fitting on the washer discharge standpipe to connect a 1/2" line to the tailpiece of the trap? This would use wastewater from the washing machine to keep the floor trap primed.