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Valve

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Joel Ashley:
I guess I'm still unsure why there is a vacuum breaker on that San-T-Flush line.  The tank vents via the roof port, and there is a backflow device immediately downstream of the breaker anyway (the part that cracked on Don's), to keep any tank fluid from going back into any potable water source via the hose attached at the water bay fixture.  Perhaps the breaker prevents water from draining back into the bay after you remove the hose, as Joel W. mentioned?  If so, might it be a good idea to bleed or blow out that line when winterizing?  Otherwise the stated intent on the product website is basically the same as the backflow device's, so is it necessary?

Joel

Brad Burgess:
Hi Joel

On the two coaches that I eliminated the vacuum break on (03 and 06 Montereys) there was no back flow preventer valve in the lines in addition to the vacuum break, either at the hookup in the wet bay or near the vacuum break.  I am surprised that both devices were found in the subject coach.

Brad Burgess

Joel Ashley:
Okay, perhaps I made an assumption here.  I figured the white plastic between the breaker and the outfeed elbow was the backflow device Don referred to;  mine is turned so I can't read the characters on it.  Perhaps it is merely a connector, but it does have a flow arrow on it.  Feel free to chime in here, Don, since you have to replace the leaky white device, whatever it is.

Joel

Brad Burgess:
Hello All

The attached photos show where I removed the vacuum breaker and installed a brass check valve in its place.  They also show the plumbing that I added so that I can fill the P-trap for the washing machine without having to run the machine itself.

Brad Burgess

Don and Kathy DuCharme:
Joel,  the leaky white plastic device is indeed a backflow preventer or check valve if preferred. It is a spring loaded valve that will prvent backflow from the red line to the blue line. As soon as I find the replacement part I will post it on this thread.  Probably will be a few days since we are on our way to attend the FMCA G.L.A.S.S rally at Berrien Springs Michigan.

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