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Old 04-06-2016, 08:04 PM   #1
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Drain for sewer bay

Our last RV had a small drain at the low point of the sewer bay. It was about 3/4" in diameter and had a short flexible tube attached - it would let accumulated liquid drain but wouldn't allow water from the road to enter. Our new coach has a nice deep, water proof bay and the low point isn't where the access cover is located. I would like to add a drain. Any idea where I could get one? I have looked at many of the RV supplies without success, although it may be because I don't know what magic term to search for.
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Old 04-06-2016, 08:17 PM   #2
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I just drilled a 3/16 inch hole at the low spot. Not wortiec about draining fast.

Search for Duck Bill Valve if you want a larger sealed hole.

Regards,

Dan
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Old 04-06-2016, 08:20 PM   #3
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Perfect. I suspected I just needed the magic term. Thanks.
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Old 04-07-2016, 07:36 AM   #4
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I just drilled a few 1/2" holes in ours. It came from the factory with one, but it was not at the lowest point, so I added a couple. I never felt that water entry from the road was a concern, but the duckbill valves are easy enough to install.

I also added a large removable hatch in the floor for the water & sewer hoses. Again, the factory hatch was not in the optimum place for my particular layout. I guess the factory used the same hatch position on multiple models.
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Old 04-07-2016, 08:28 AM   #5
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I added several 'drain points' in our wet bay - since our DP uses DEF, and the walmart brand container funnel comes with rubber 'air inlet', I installed these in 3/8" holes in several places thru the wet bay floor. It lets water out, but no water in while traveling through wet weather, or small critters either.
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Old 04-07-2016, 09:11 PM   #6
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Quote:
Originally Posted by dpinvidic3010943
..... Search for Duck Bill Valve if you want a larger sealed hole.......

I may be wrong, but I believe a duckbill-- also called a joker valve in marine applications-- requires at least a slightly pressurized line to force it open.

My 02 DS has a 1-1/4" hole formed in the fiberglass floor of the water bay for drainage. A simple, old fashioned rubber sink stopper fits perfectly to stop road spray, bugs, and small critters.


John & Diane, fulltiming since '12
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Old 04-07-2016, 09:41 PM   #7
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Quote:
Originally Posted by JFXG View Post
I may be wrong, but I believe a duckbill-- also called a joker valve in marine applications-- requires at least a slightly pressurized line to force it open.

My 02 DS has a 1-1/4" hole formed in the fiberglass floor of the water bay for drainage. A simple, old fashioned rubber sink stopper fits perfectly to stop road spray, bugs, and small critters.


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I think you are correct.

But it would be easy to "damage" the flaps enough so they would leak out water but still prevent stuff from coming in.

Just make a few cuts in them with side cutters or a razor knife.

Dan
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Old 04-07-2016, 10:11 PM   #8
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Quote:
Originally Posted by dpinvidic View Post
I just drilled a 3/16 inch hole at the low spot. Not wortiec about draining fast.

Search for Duck Bill Valve if you want a larger sealed hole.

Regards,

Dan
I donno how 2 holes appeared in my wet-bay, but they allow liquid to drain away. If DOT ever stops me for leaking onto the road and gives me a citation, I'll just fill the holes with screws. I was stopped once when we had a 5er. I was draining the fresh water tank enroute home. Seems leaking any liquid from a vehicle onto a roadway is cause for a stop.

Nope, duckbill valves do not require pressure to drain. The air intake chamber in my engine compartment has one on the bottom to allow rain-water to drain away instead of building up and wetting the air filter. My basement A/C unit has one for condensate to drain away, it will get stopped up with crud once a year or so and require squeezing it to allow the crud to break up and fall out.
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Old 04-10-2016, 12:31 PM   #9
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Originally Posted by Ray,IN View Post
I donno how 2 holes appeared in my wet-bay, but they allow liquid to drain away. If DOT ever stops me for leaking onto the road and gives me a citation, I'll just fill the holes with screws. I was stopped once when we had a 5er. I was draining the fresh water tank enroute home. Seems leaking any liquid from a vehicle onto a roadway is cause for a stop.
I can understand draining a tank while driving to be a problem.
But a little dripping from the wet bay should not be a concern.
Most of the water will drain while your at the dump station anyway.
The reason I put one in is to just keep the wet bay dry....so it is a Dry Bay
similar to the dripping from the AC condensers while driving.

Regards,

Dan
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