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andy29847 · 07-15-2019, 06:20 PM

I was flushing the black tank on my 2001 38' coach when I started getting water coming out all around the wet bay. A couple of hours of taking things apart found a bad anti- siphon valve.

This valve is located behind the pull out panty shelf, about 3' off the floor. Water was coming out of it like a showerhead. I searched the valve manf and model number and found trouble reported on a lot of different RVs. I believe I can replace the valve with a elbow. I used a borrowed shop vac to suck up the water and ran fans in the space all afternoon. Sometimes life on the road is tuff.

RVPioneer · 07-16-2019, 08:23 AM

I would not recommend altering the original design of the system by replacing a vacuum breaker with an elbow. Look for a higher quality component if you have concerns about using the original as a replacement.

Ljwt330 · 07-16-2019, 10:02 AM

Quote:

Originally Posted by RVPioneer

I would not recommend altering the original design of the system by replacing a vacuum breaker with an elbow. Look for a higher quality component if you have concerns about using the original as a replacement.

X 2!

The purpose of the valve is to prevent any fluid, think contents of a full black tank, from being siphoned back out through the flush tube. Replacing with just an elbow defeats the purpose of that safety requirement.

andy29847 · 07-16-2019, 09:46 PM

Quote:

Originally Posted by Ljwt330

X 2!

The purpose of the valve is to prevent any fluid, think contents of a full black tank, from being siphoned back out through the flush tube. Replacing with just an elbow defeats the purpose of that safety requirement.

I appreciate your response. I think the potential for poop problems is lower than potential for filling the coach with water again.

Ljwt330 · 07-17-2019, 10:36 AM

Quote:

Originally Posted by andy29847

I appreciate your response. I think the potential for poop problems is lower than potential for filling the coach with water again.

Certainly this is your choice and I agree, the potential is greater for another leak than a siphoning. I would only suggest that you make note of the change, in writing, and make sure any future owner of your MH is aware of the change if you don't change it back before selling. As stated, there is a reason for vacuum breakers on certain plumbing fittings and these are required for the RVIA certification.

The failed fitting was 18+ years old. Replacing with a like or better quality fitting would seem to be a long-lasting fix.

DrDaveMA · 07-18-2019, 09:45 PM

Quote:

Originally Posted by Ljwt330

Certainly this is your choice and I agree, the potential is greater for another leak than a siphoning. I would only suggest that you make note of the change, in writing, and make sure any future owner of your MH is aware of the change if you don't change it back before selling. As stated, there is a reason for vacuum breakers on certain plumbing fittings and these are required for RVIA certification

Not to mention local health codes, you are connecting a black water tank to the local water system[emoji37]!