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Old 08-25-2014, 05:43 PM   #1
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Gray water tank Venting in Shower

1996 Fleetwood Pace Arrow Vision. When we drain the sink drain after washing dishes, the shower drain bubbles up and the water backs up into the shower. I have tried to run a snake down the drain but it wont make the bend. I have removed the vent cover for the gray water tank and ran a snake down to the tank, I know this cause I measured it and the end was wet when I pulled it out. I replaced the top vent cap with the one that rotates in the wind. I have put chemical down the drain of the shower that dissolves grease and breaks down waste a few different types. I have used dishwasher detergent. I don't get the smell but its still clogged up. Any other Ideas that could help would be greatly appreciated.
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Old 08-25-2014, 08:26 PM   #2
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Pull the pea trap from under the sink and run the snake from there.it should be the furthest point from the tank and all the other lines tie into it. Ours runs Kitchen sink, shower, lav sink,lav sink, tank .The vent on ours is at the second lav sink so you could get a clear vent and still back up.
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Old 08-26-2014, 04:16 AM   #3
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Check for a bad under the sink vacuum breaker vent.
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Old 08-26-2014, 04:24 PM   #4
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How do I know if the vacuum breaker vent is bad or not?
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Old 08-26-2014, 07:18 PM   #5
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If you have water that won't drain in the shower, remove the vacuum breaker. If you get a puff of air out of the pipe and the water goes down the vacuum breaker is sticking. You may have more then one. The actual name of it is air admittance valve, common name vacuum breaker. You can buy them at Lowes and Home Depot.
Amazon.com: Air Admittance Valve

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