This item is required to connect the water supply to the RV. It depressurizes the line at the fitting, allowing you to connect or disconnect the hose. I had 2 of these, forgot one at the state park, the second one I got was assembled upside down with the diverter facing up. It still works, but I have to watch when I turn it on or I'll take a shower. Not a big deal, and it gets laughs when someone pockets it. Good quality and yes the case is made of durable plastic and will hold up well.
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