Valterra Products inc. Mfr #A01-0141VPPart #MRVS_5740
It's a spring loaded check valve that stops the backflow of water into the fresh water supply. You can simply screw it on and off when attaching the water line to the faucet.
MobileRVService price
$5.15
$5.42 retail · Save $0.27
Quantity
Still not sure if this is the right part for you?