schrockbike Posts: 1, Reputation: 1 New Member   #1 Oct 11, 2007, 11:05 AM

Vent for Washing Machine Drain Attached to Existing Drain Line "Current setup for a washing machine has the discharge hose "hooked" into a laundry tub. Tennants would like something more "permanent." The laundry tub has a normal trap followed by a horizontal run of about 2 feet (2" threaded pipe) then "T's" into a vertical drain/vent. The vent line goes up through the ceiling then apparently into the wall and I assume the kitchen sink attaches to it, but I don't know for sure. Directly below the "T," is a "Y." The left side of the "Y" is where the laundry tub is draining through the "T" then down into the "Y" (the otherside of the "T" is the vertical vent line. The right side of the "Y" is where the kitchen sink drain joins the laundry tub drain. The kitchen drain line is coming straight down from the ceiling, then a "45" near the floor takes it over to the "Y" I just described. So, it is possible, I guess that the vent for the kitchen drain line is the same one for the laundry tub, since the kitchen drain line joins the laundry tub drain line just below the "T" where the vent line is going vertical. I wanted to create a separate drain line for the washing machine. I thought, at first, I could just cut into the 2' horizonal run of the laundry tub drain line and that would allow the existing vent to service both the laundry tub and now the washing machine. If I did this, I guess I would essentially have an "S" trap for the washing machine since the vent would not be coming off a horizonal line. I heard once that "S" traps aren't allowed. I thought maybe create a "P" trap with a horizonal run -- either to the kitchen sink drain line or into the laundry tub line by using a "45" or a "90" and then dropping down to the laundry tub line. I would then put a vent off the new horizonal run (that is part of the "P" trap, and attach it to the existing vertical vent, but if the existing vertical vent is servicing the sink above, then I think I would have to attach the new vent (for the washing machine) above the "flood" line for the kitchen sink. That would mean that I would have to cut into the wall upstairs and I don't want to do that. I could diagram this a whole lot easier than trying to describe it. Maybe you have a fax? Or I could scan and attach it to an email? Any wisdom or suggestions."

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