In a typical installation, the anti siphon valve is located at a “high” point, and once you remove the hose from the outside connection any liquid will simply drain off. The only issue I see is the valve itself. I would simply blow air or if readily accessible remove it.
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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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