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buckarooman's avatar
buckarooman
Explorer
Aug 01, 2016

Sinks not draining/poor venting?

Two new under sink vents and it still is not draining my sinks, if I unscrew the air vent the sinks will suck down like a champ. I can't have a roof vent because I have a island sink, the only roof vent I've got is for the bathroom gray water tank and the black water tank, and there is only one vent but I don't have issues with the bathroom tank or the black tank. I'm at a loss, either my tank just is vented poorly and it's what I get to live with.

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  • buckarooman's avatar
    buckarooman
    Explorer
    Aug 01, 2016
    Old-Biscuit wrote:
    If you drain galley tank and leave drain valve OPEN does kitchen sink drain ?

    Which Air Admittance Valves are you using......cheap $5-$6 black ones from Home Depot/Lowes?


    The tank will drain great when it's drain valve is opened, I need to change out the gate valve as it has a drip. The admittance valve I've used was one from Home Depot first, then camping it did it again so I ran down to a rv parts store and got one from there. Is there a better type of valve?
  • Old-Biscuit's avatar
    Old-Biscuit
    Explorer III
    Aug 01, 2016
    If you drain galley tank and leave drain valve OPEN does kitchen sink drain ?

    Which Air Admittance Valves are you using......cheap $5-$6 black ones from Home Depot/Lowes?

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