I may be wrong but I don't think they are built into an RV. That's why many cg's and parks will have one attached to the faucet. I've never heard of a park where you have to furnish it. That's a new one.
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Earl
2007 33.5' Arctic Fox Fifth Wheel used for full-timing for several years--now sold
2011 Hideout 23RKSWE that we now use for poking around local parks
2007 Chevy 3/4 ton diesel with Prodigy Brake Control
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