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Old 10-21-2017, 08:31 PM   #1
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Kitchen sink not draining Jayco FIFTH wheel

Kitchen sink of my new 29.5 HT fifth wheel is not flushing. It almost looks like airlocked. The tank is empty and no solids we t down the drain. Please help if anyone has seen anything like this. I removed the trap and checked and it was very clean. Air somehow is not venting. The vents on the roof are clear. Is there any switch to be tirned on? Any suggestiins would help. Bathroom sink is draining without a problem. Is there a vent on the grey tank?
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Old 10-21-2017, 08:55 PM   #2
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I would fill the sink with some water and take a toilet plunger to it, hopefully that may clear out whats backing it up
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Old 10-21-2017, 11:11 PM   #3
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Thanks! I already did that and also checked the plumbing, removed the trap. This seems to be a air venting issue. Air bubbles come up as I force the water in to the tank. Is is okay to use a snake ir will it damage sensors?
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Old 10-22-2017, 12:20 AM   #4
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Sounds like a vacuum breaker is stuck closed. It will be on top of a stub pipe at about sink level. You should be able to just unscrew it, free it up, and replace it. Look care fully at the top of the vertical pipe going down to your tank.

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Old 10-22-2017, 06:59 AM   #5
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Thank you very much! This sounds very logical . I shall try this one, but may need to find out where this is. Is this to be accessed from inside the RV or on top of the roof? Does anybody have the plumbing diagram for HT 29.5?
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Old 10-22-2017, 07:28 AM   #6
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The vacuum breaker on my trailer are under the sink relatively close to the sink drain trap. I would start by looking there.
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Old 10-22-2017, 05:07 PM   #7
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Thank you very much! I shall look under the sink. Do you know where I can get a replacement and the standard dimensions of the vacuum breaker?
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Old 10-22-2017, 06:24 PM   #8
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Quote:
Originally Posted by Bobmadras View Post
Thank you very much! I shall look under the sink. Do you know where I can get a replacement and the standard dimensions of the vacuum breaker?

You can get it from any major home improvement store, maybe even from a good hardware store..

I would unscrew it, and test it, before buy one.
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Old 10-22-2017, 10:54 PM   #9
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just pop that cap off and push down on the plunger to free up the valve and re-install it. It is unlikely you will actually need to buy a new one.
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Old 10-24-2017, 05:59 PM   #10
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I will tell on my self. My jayco has two drains for the gray water. I only opened one and the kitchen would not drain. Found the other drain handle outside of the area where the other 3 handles were located.
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