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Old 07-05-2021, 03:45 PM   #1
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Join Date: Apr 2017
Posts: 44
Slow Drain Kitchen Sink

Kitchen sink draining slow is driving my DW crazy, so life in the motor home is not as good as it could be. We have an Allegro Red 37PA and it has an Air Admittance Valve under each bathroom sink and they are not a problem. Can't find a valve under the kitchen sink nor a p-trap. Is this the slow drain problem or has Tiffin handled the p-trap/AAV some other way?
2015 Allegro Red 37PA - 2014 Ford C-Max Toad

Lloyd and Jann
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Old 07-05-2021, 05:27 PM   #2
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My bet is your drain line is pinched when the slide goes out. You probably have a 2 inch flexible hose that goes from the drain into the grey water tank. I had the same issue and found that when the slide went out the line got pinched and wasn’t even. I cut about 2 inches off the line and has worked fine ever since. Does it drain slow with the slide in?
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Old 07-06-2021, 05:10 AM   #3
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Mine has a Hepvo valve that needs to be cleaned sometimes.
2022 Tiffin Allegro Bus 35CP, 2015 RAM EcoDiesel
2017 Tiffin Allegro RED 33AA (sold)
2016 Airstream Interstate Grand Tour (sold)
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Old 07-06-2021, 06:58 AM   #4
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How did you clean the hepvo valve? Drains slowly when slide is in also.
2015 Allegro Red 37PA - 2014 Ford C-Max Toad

Lloyd and Jann
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