At Home Depot you can get a screw on anti-siphon valve for less than $10. Or you can get a screw on self draining anti-siphon valve for about $25. Although it cost more I would opt for the self draining. It is the same as you often see on outside water faucets, including those at RV parks.
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Bill & Patricia
Riley, our Golden
2007 3075RL (recently sold, currently without)
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