I'm roughing in my washer with 2" pvc and want to place the p-trap within the wall. I don't need a vent because I'm circuit venting through a bathroom group. Does the fact that the trap arm (4") is greater than 2 times the pipe dia (2") not make this a s-trap? Is it just habit that most plumbers use a vent here anyway?

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Originally Posted by jtam

I'm roughing in my washer with 2" pvc and want to place the p-trap within the wall. I don't need a vent because I'm circuit venting through a bathroom group. Does the fact that the trap arm (4") is greater than 2 times the pipe dia (2") not make this a s-trap? Is it just habit that most plumbers use a vent here anyway?

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I'm not a plumber, and therefore not terribly familiar with codes, but I don't think you can put the p-trap within the wall... it has to be "accessible" at least, I think.

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Originally Posted by jtam

I'm roughing in my washer with 2" pvc and want to place the p-trap within the wall. I don't need a vent because I'm circuit venting through a bathroom group. Does the fact that the trap arm (4") is greater than 2 times the pipe dia (2") not make this a s-trap? Is it just habit that most plumbers use a vent here anyway?

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You may place the washer trap in the wall but if your trap will end up looking like this it is illegal,(see image). Good luck, Tom

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Originally Posted by speedball1

You may place the washer trap in the wall but if your trap will end up looking like this it is illegal,(see image). Good luck, Tom

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Thanks Tom... your images really help. You must have a hard drive just full of these cause you always seem to reply with just the right one! Jim

You must have a hard drive just full of these cause you always seem to reply with just the right one! Jim

Hey Jim,
When I left AskMe.com they gave me a choice of retrieving all my posts in rough format. It took me two months of sorting and editing to make them into a data base that I could use on this site. I also have a extensive data base of images that I can draw on. Thanks for the interest. Tom