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Old 05-01-2016, 04:05 PM   #15
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Vintage Kin Owner
Bathurst , New Brunswick
Join Date: Jun 2015
Posts: 24
What about using an horizontal check valve, in place of a p trap. It has a rubber bladder which allows water to go out but not back up. I think i got it at VAS

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Old 05-01-2016, 06:38 PM   #16
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2015 25' FB International
Join Date: Nov 2014
Posts: 405
I appreciate the help everyone. I really had no option but to go for it and hope for the best. As always, my wife was with me... so I made (begged) her to take the ride to the dump station in the shower while on the phone with me. Good news and bad news.

The bad news is that after a nightfall of rain, those trailer brakes were reeeeeally sticky and tossed my bride pretty good. She's fine! The good news is that there was no water at all. She did have the drain plug in but there's no way that thing would stop anything other than a bubble from coming out.

For reference the tank was actually at 95% upon moving. And now we know!

Thanks again!

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Old 05-01-2016, 09:02 PM   #17
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1977 31' Sovereign
Lynnwood , Washington
Join Date: Jan 2015
Posts: 282
When the grey tank is full, the back-up reservoir, by default, is the shower basin. The second back-up will be the bathroom floor. LOL

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Old 05-02-2016, 07:42 PM   #18
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2015 19' Flying Cloud
Rosemount , Minnesota
Join Date: Oct 2015
Posts: 74
And for those that find themselves pushing the limits, the black tank shares the same vent stack as the grey tank (at least on our 19' FC). So if it comes to overfilling things and the shower is corked tight, I wonder if a little of the grey water would rise in the vent stack and find its way into the black tank? I think the black tank connection to the vent stack is below the sink drains.

If someone experiments, please make sure you include videos along with the dialog and photos!

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