winterizing black tank flush with air
I've always been successful winterizing by just blowing air through my water lines. I know there is an anti-siphon valve in the black tank flush system. Will just blowing out this line clear water f...
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ScottG wrote:
Yes, I just blow them out.
Our new TT doesn't seem to have any backflow device though...
It probably does. I had the same issue of disconnecting the hose and water flowing back out. What I figured out is that the back-flow check-valve is on the other side of the trailer where the sprayer is attached to the tank. Behind the wall where I hook up the supply hose the line that goes over to the black tank goes up first. So when I disconnect the supply hose the water on my side of the check valve can still flow back and out the inlet. I simply added another check valve right behind the wall.
OP .... Sorry for the off topic right turn on the thread.
