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Artemus Gordon · 05-31-2013, 09:19 AM

It's the safety valve in the vent system. Spring loaded and they get stuck. I have one under kitchen sink and one in bath room. Think it's called anti siphon vent check valve. Not all are the same. Very weak link in the system !

05-31-2013, 09:19 AM	#5
Artemus Gordon Montana Master Join Date: Mar 2012 Location: Redding Posts: 1,421 M.O.C. #12339	It's the safety valve in the vent system. Spring loaded and they get stuck. I have one under kitchen sink and one in bath room. Think it's called anti siphon vent check valve. Not all are the same. Very weak link in the system !