I took mine out a long time ago, but I have a brass one on a little garden hose protector (one of those really short hoses with the spring on it) that goes on first when I flush. The purpose of the backflow preventer is to keep contaminated water out of your hose in the event of a drop in water pressure. Unlikely to happen when you're flushing, but still a possibility that can be guarded against for less than five bucks.
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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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