Cacher_Chick
Test, Don't Guess!
My 4" CI stack enters the building drain (above the floor) via the side inlet of a cottage fitting. On the upstream end of the cottage fitting is the building drain cleanout.
What I would like to do is add a 4x4x1.5 wye in the building drain between the cleanout and the existing cottage fitting for a laundry tray drain pump. This would be at the highest point of the building drain and would have to flow past the side inlet from the 4" stack. The drain pump will have it's own separate vent.
My gut says I shouldn't have the drain pump discharge flowing past the main stack inlet, but I'm not a plumber. I don't see that it would cause a problem, but Is this acceptable or not so much?
What I would like to do is add a 4x4x1.5 wye in the building drain between the cleanout and the existing cottage fitting for a laundry tray drain pump. This would be at the highest point of the building drain and would have to flow past the side inlet from the 4" stack. The drain pump will have it's own separate vent.
My gut says I shouldn't have the drain pump discharge flowing past the main stack inlet, but I'm not a plumber. I don't see that it would cause a problem, but Is this acceptable or not so much?