chihotdog13
New Member
My home had cast iron 3" with back to back toilet. It used a 4 way cross, and I don't remember water being stolen with new toilets. PVC was upgraded and a 4 way cross installed, but noticed water was being stolen. I've read many posts in this forum on this top, and learned that a double fixture fitting was needed to help with that. Once has since been installed, but now, the toilets are still stealing water. The horizontal length from center of flange to the main stack is 17" and the other is 16". The vent is clear because some of that cast iron was replaced with PVC as well. Also, both toilets go from 4" to 3" with a closet elbow, then straight horizontal into stack, stack being 3".
I'm guessing the only way to fix this would be to separate the two, so that you stack a Long Turn Wye on top of the another long turn wye. I don't think my issue is water shooting up the other side, but the siphon air action stealing water.
Instead, would it be possible to place another two long 90 bends in one side, so that the air takes more time to reach the toilet?
Current: vertical 4" > closet elbow (4" reduce to 3") > 3" horizontal into double fixture tee
Proposed: vertical 4" > close elbow > short 3" horizontal > 90 long turn > 3" short vertical > 90 long turn > 3" horizontal into double fixture tee
Thanks
I'm guessing the only way to fix this would be to separate the two, so that you stack a Long Turn Wye on top of the another long turn wye. I don't think my issue is water shooting up the other side, but the siphon air action stealing water.
Instead, would it be possible to place another two long 90 bends in one side, so that the air takes more time to reach the toilet?
Current: vertical 4" > closet elbow (4" reduce to 3") > 3" horizontal into double fixture tee
Proposed: vertical 4" > close elbow > short 3" horizontal > 90 long turn > 3" short vertical > 90 long turn > 3" horizontal into double fixture tee
Thanks