I am connecting a PVC "y" to my main sewer main which is cast iron. The drain itself will only be about 7 feet from the connection. Should I vent? And if so where? Thank you for helping a helpless do it yourselfer.17737

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First: what is this set up intended for? Floor drain or shower drain ? Is there going to be any wall between the drain head and the sewer connection ?
Second: that 3"x2" is not Y but Sanitary T. Sanitary T is used for horizontal to vertical transition. Here, you should use 3"x 2" Y with 45 to make that transition.

The drain is for a shower. The door to the shower will be in between the new connection and the drain.

Hi jtfloor:

A shower drain requires a 2" ptrap (that trap looks like an 1.5" ptrap?). You need a 3"x2" WYE as mentioned by Milo, and since it is for a shower, you will also need to add an 1.5" vent for sure.

The 1.5" vent can come off a 2"x1.5" sanitary tee fitting within 5 feet of the ptrap. The fitting should roll above the centerline of the drain line to be a real vent connection.. which will be hard from what I see for depth here. The vent runs up and connects into another vent in the basement or in the attic.

What kind of shower are you building/installing? I have never seen anyone use that particular drain for a shower. That drain is for a floor drain.. usually..? Let me know more... OK?

Thanks...

MARK

Well Mark, I do carpet and tile for a living so my idea is to custum build the basin with dry pack and build walls around it so I can do some ellaborate tile work in it. I am planning on building the basin and the drain up above the rest of the concrete,like as a step up into the shower just because the main sewer isn't very deep. Do you think this idea will work or should I do more research and head back to the drawing board? Thanks for the reply.

Cool!

But you will also need a liner of some sort...

I would recommend a vinyl membrane pan that you build yourself. The proper drain (see picture) and the vinyl membrane and vinyl membrane cement will be available at home depot.

You will need more information here to prevent water from leaking out the shower or creating a moldy condition that could eventually destroy that great tile job you want to do... ok?

Check out this link for more information: http://www.hoagy.org/house/HowToBuildShowerPan.html

Glad to work with you as you move forward.

MARK

Listen to Mark and Milo and do it right. Come off the main with 3X2 wye or combo,(see inages) and roll up a 2 X 1 1/2 " Sanitary tee foe a vent. Mark's bang on when he suggested a flange type shower drain and a shower pan instead of a floor drain. Go back and do it over. Good luck, Tom

Mark is right. This appears to be floor drain or roof drain - not a shower drain. The drain in the photo cannot take water-proofing as the correct shower drain should. Cut this one out and install the one as shown in Mark's post.