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Old 03-14-2014, 08:46 PM   #1
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Does the SaniFlush really need that purge valve?

While winterizing my TT, when I pushed in the SaniFlush purge valve, it shot out like a bullet never to be found. Do I really need that thing? Isn't it really just there for code as a back flow preventer? Is it relatively a safe bet for me to skip the hassle of cracking he seal on the back if the trailer in order to pull it off and install this new fitting I bought? It's not as simple as pushing in a new purge valve as you have to crack out the flanged fitting and all to do it.

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Old 03-15-2014, 11:04 AM   #2
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CALIFICATION: I mean the SanTFlush purge "Button" inside the rinse inlet hose fitting

I am talking about the SanTFlush on the back end of my TT. It is the tank flushing winterizing purge 'button' inside the SanTFlush inlet for flushing out the black tank. The winterizing instructions advised that one should push in the purge button as part of the process to allow any water still in there and under pressure to come out before it freezes. There must have been so much pressure that the entire guts sprang out of the fixed hose inlet fitting that is mounted to the outside rear wall.

In order to replace it I would need crack the seal around that fitting gasket, remove 3 screws, and somehow unscrew the fitting from inside the wall (the replacement appears to screw into something deep in the wall and then seal and screw the attached flange back on the wall). My SanTFlush that is missing the purge button is so well fixed in place that I hesitate to monkey with taking it out if really not all that necessary (even though I have the replacement part). It just seems superfluous if all it does is prevent black water from backing up into the hose if you forget to watch over the SanTFlush process when doing it (which I don't intend to let happen).

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Old 03-15-2014, 06:29 PM   #3
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Intent aside, the valve is there for a very valid reason; to protect the public drinking water system from an accidental backflow of contaminated water. Although the odds are miniscule, the RV park owner can be heavily fined for a tenant not having a backflow prevention device.
I think your simplest, cheapest solution would be to buy one that screws onto your hose fitting on the RV.
2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG retired;Good Sam Life member,FMCA."We the people are the rightful masters of both the Congress and the Courts - not to overthrow the Constitution but to overthrow men who pervert the Constitution. "Abraham Lincoln"
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Old 03-16-2014, 05:56 AM   #4
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Ok that is norhing more than a spring chck valve... IT IS NEEDD.

What I would do (Actually did since I was not sure what was inside my rig) is go to ye old hardware and get two things, both brass, one is a "Spring check" valve, the other a vacuum breaker

Hose---Vacuum breaker--Spring check--Flusher inlet

When you are not flushing (Before you dump the tank PLUG the inlet

Or, get a new inlet, standard RV city water inlet, not that expensive.

Mine uses a vacuum breaker inside the RV, thus when I unhook a gush of water comes flying back at me, but it's all fresh water.
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Old 03-16-2014, 10:45 PM   #5
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Think about it for a moment. If the black tank purge line is open at the tank (which it has to be through the flush nozzle), how could the valve in the line be pressurized? Something odd here.

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