I use a reg at the inlet that is connected to a tee. Off the tee, I have one connection to the house supply and another short hose to the Black tank Flush. The Blue Stripe hose is the inlet city supply which is regulated to 60 PSI Max. Never have to worry about over pressure and it allows full flow at anything under 60 PSI. With this set up I can run the Black tank flush or switch to house supply without having to switch hoses.
Tried to load a photo of my set up but my CG WiFi won't handle it. Sorry.
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2019 Unity LTV CB, pushed by a 2013 Honda CRV, BlueOx Baseplate, Aventa Bar & Patriot Brake
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