Yes you do have a backflow preventor and in most Monty's it's under the bathroom sink. If the pressure is ok for your rig it should be ok for the black tank flush. I've only been two places that I wouldn't hook up the flush without a regulator and both had water pressure over 100psi.
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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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