If the Anti siphon valve isn't under the sink then it's behind the shower faucet. Remove the square head screws and the faucet assembly will come out. Then just look for the piece shown in the picture. I've seen black and white ones.
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2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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