Posted 7/24/2014 12:31 (#3983716 - in reply to #3982761) Subject: RE: Drain plumbing question, Master Plumbers?
White Stone, Virginia
Fall is right. Remember you must have air (vent) behind water on every device! Each one needs a vent, that an be tied together to the main vent. The vent at each device keeps the water in the trap for the device from being sucked out as the slug of drain water from the upstream devices flows past. No vent and the slug of drain water will suck air from the drain siphoning off the trap water.
Drain plumbing question, Master Plumbers?
