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You are probably right, but I don't think there is anyway to check that little worthless valve short of removing it. Many of us took them out, in my case while the rig was still under warranty, and use an external backflow preventer.
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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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