All kinds are definitely a problem. Over the years we have parked next to two trailers that had the electric valves installed, one factory and the other aftermarket, that wouldn't drain. That added an extra complexity to it because now it could be an electrical as well as a mechanical problem. Having seen it twice I've decided to stay with the problems I have.
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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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