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It's a check valve that won't let you accidently start a siphon and suck water you don't want in a direction you don't want. You don't want to suck black tank contents into your feed hose or the system supplying water to the camper.
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-- Mark
I used a multi-billion dollar government satellite navigation system to look for a rubber chicken in a tree!
2017 Bullet 248RKS towed by a 2011 Chevrolet Silverado 5.3L V8 W/ AFM
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