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What is the open pipe in the middle of the plumbing for your double sink with dw and disposal that sometimes backs up and spews all over under the sink and is it correct or required?
Ainsleyp
It could very well be an "Air admittance valve." Plumbing systems require a smooth flow of air and water to operate properly, these vents historically were routed through the roof and allow for the relief of positive and negative pressures in the vent system.
"Air admittance valves" are installed under sinks and lavatories that are inconvienient to route a vent to the roof.
These vents while handy do not respond well to back pressure, they are designed to seal during moments of positive pressure and "breathe" while in moments of negative pressure, this is to prevent sewer gas from entering the room.
The purpose of the trap is to prevent sewer gas from entering the room, the purpose of the vent is to relieve positive and negative pressures in the drain and vent system to prevent trap seal loss.
The slang name for an "air admittance valve" is studor vent. "Studor" is a manufacturer of AAV's
Hope this helps
Wiki User
∙ 14y ago
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