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06-07-2013, 07:46 AM
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#1
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Montana Master
Join Date: Oct 2006
Location: McKinney
Posts: 7,167
M.O.C. #6433
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Black Tank Flush Leak Problem Resolved
As I mentioned in an earlier post, last trip when I turned on the black tank flush I got a floor full of water inside. The antisiphon valve was badly cracked. Although some of you said you had just eliminated the valve, replacing it with a piece of PEX pipe and fittings, I wanted to put it back as it was.
No RV parts stores I could find carried antisiphon valves any thing like it. Finally located the original manufacturer in Sugarland, TX. Could only buy direct from him, so I ordered one.
Rest of the story.
I could not understand how the original valve (clear plastic) could have cracked so bad. Cracks running all thru it. Looked as if it had frozen, But I had run antifreeze thru that line, and the valve is not supposed to hold water anyway. Well after receiving the new valve I now understand. The new valve has a row of tiny cracks all around the perimeter of the valve just under a raised lip near the top. Looks like stress fractures just waiting to start running thru the rest of the body of the valve. Apparently a flaw in the manufacturing process.
So off to Lowe's to get some PEX pipe and fittings to eliminate the valve altogether. I can see where there is a very remote chance under very specific conditions of siphoning black water back thru the line. But it is so highly unlikely I am not concerned about it. I may go back later and add a check valve, but at least for now that problem is solved. Should have listened to you guys in the first place.
And I now have a new opening to get to those fittings.
__________________
Bill & Patricia
Riley, our Golden
2007 3075RL (recently sold, currently without)
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06-07-2013, 09:27 AM
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#2
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Montana Master
Join Date: Dec 2011
Location: Roswell
Posts: 627
M.O.C. #12028
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Glad to hear you have it resolved.
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06-07-2013, 10:38 AM
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#3
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Site Team
Join Date: Jun 2011
Location: Wilsey
Posts: 18,799
M.O.C. #11455
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I removed mine before we had any problems. Restaurants are required to have back flow preventers on everything and so they make one that fits on a garden hose outlet. I bought a brass one of those, put it on a small extension hose (the little ones with the springs on them), put quick disconnects on both ends and just snap it in place when I want to flush. No worries about back flow and no cheap plastic valve to leak in the rig.
__________________
Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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06-07-2013, 12:19 PM
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#4
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Montana Master
Join Date: Oct 2006
Location: McKinney
Posts: 7,167
M.O.C. #6433
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Where did you find those, Dick?
__________________
Bill & Patricia
Riley, our Golden
2007 3075RL (recently sold, currently without)
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06-07-2013, 12:38 PM
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#5
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Montana Master
Join Date: Jun 2004
Location: Benson
Posts: 3,121
M.O.C. #1658
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Any hardware store will have the backflow preventer for outside faucets
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06-07-2013, 01:50 PM
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#6
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Montana Master
Join Date: Jan 2012
Location: Copperas Cove
Posts: 1,426
M.O.C. #12096
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I forget which fittings I got but just took my valve into Lowe's and the guy there helped me find a couple of fittings to put together to replace it. It all just screwed together and now it is a straight shot, no dang back flow junk that you really don't need to begin with.
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