2inAlabama
Huntsville, AL
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I have the No-Fuss Flush feature on my coach, allowing me to flush my black tank by connecting a water hose to a faucet and to a connection on the tank, then turning the water on. My owner's manual cautions not to use my potable water hose to perform the flush, but it says nothing about using a backflow preventer on the hose used to do the flush. Do I need to use one? If so, can anyone recommend a brand/source?
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Stuck in first
Virginia
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Mine is built in. I think it is a requirement. When you disconect the hose the water up to the backflow preventer will run out but it will be fresh.
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Dick_B
Palos Heights, IL USA
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X2
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Executive
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That caveat is so you don't contaminate your fresh water hose. Get yourself a cheap green or black hose from Home Depot. 25' is sufficient. Use that hose ONLY for your no fuss flusher. Keep your fresh water hose separate from anything connected to the black tank....Dennis
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belairbrian
Alabama
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While I agree with a dedicated hose, i don't agree with a cheap hose from Home Depot or where ever. Yes you can get one for $10. But Sears will sell you a quality rubber hose for $23. And if it ever goes bad they will give you a new one for FREE.
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2inAlabama
Huntsville, AL
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My question has nothing to do with the hose. I understand that I need to use a separate hose to flush the black tank. Do I need to use a backflow preventer with it? Maybe I just need to contact Tiffin to find out if one is built into the system. Thanks anyway, Guys.
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belairbrian
Alabama
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2inAlabama wrote:My question has nothing to do with the hose. I understand that I need to use a separate hose to flush the black tank. Do I need to use a backflow preventer with it? Maybe I just need to contact Tiffin to find out if one is built into the system. Thanks anyway, Guys.
Heaven forbid someone other than you might read your post and get information.
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TexasH
Katy, TX
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Use one of These anti siphon valves on your hose to prevent any backflow from the tank into the water system. I put it on the end of the hose attached to the faucet. I also use a Shutoff Valve where the hose connects to the flusher. Makes it easy to turn water on and off while flushing, and by turning off the water here before turning off the faucet, it prevents any backflow into the hose when it is disconnected.
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Cool Canuck
Winnipeg, MB, Canada
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2inAlabama wrote:I have the No-Fuss Flush feature on my coach, allowing me to flush my black tank by connecting a water hose to a faucet and to a connection on the tank, then turning the water on. My owner's manual cautions not to use my potable water hose to perform the flush, but it says nothing about using a backflow preventer on the hose used to do the flush. Do I need to use one? If so, can anyone recommend a brand/source?
You need to keep a sense of humor on this forum. 
It put a black tank flush on my last trailer and used it all the time without a back flow preventer. The trailer we have now has a flush installed and there is a back flow preventer. Somewhere along the way, plumbing codes have insisted that back flow preventers need to be installed anytime fresh water connections come in contact with sewer lines. If your coach is newer that 10 years old, I suspect you have one. I you don't, you don't NEED one.
I have no qualms about using my fresh water hoses on my flush, but that's me.
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xctraveler
Livingston TX
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It appears both of the items recommended by TexasH are plastic bodied. I have had enough plastic bodied hose fittings disintegrate over time that I have chosen to pay a bit more and buy brass fittings. Any plumbing supplier will have brass versions of the anti siphon device and the shutoff valve. Have only had one brass item (made in China) fall apart on me in service. Just my experience!
Make sure when you turn off the water at the spigot that you stand clear as the anti siphon device may spray water if there is any pressure left in the hose.
I rely on the required anti siphon device or check valve in the flusher connection to prevent backflow and turn off the valve so that pressure is relieved in the hose then disconnect the hose from the valve first so that the fresh water in the hose can flow out onto the ground rather than into my bay and I don't take an unplanned shower.
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