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RV water systems are designed for modest water pressure. The typical built-in 12-volt pump produces a maximum of 45 psi or 55 psi, which is enough for a decent shower. But when you hook up to “city water” there are no guarantees. I’ve been connected to water supplies as low as 18 psi (wow, does that take a LONG time to fill the fresh tank), and as high as 125 psi, which is enough to damage water system components. It’s always a Russian-roulette game, and it’s one you really don’t want to play. Always test the water pressure before you hook up The short story is to always test the water pressure before you hook up. But this involves digging out your water pressure gauge (now which drawer was that in?), screwing it onto the faucet, testing, unscrewing, and then (finally) attaching your water hose. For most of us, it kind of begs for laziness (“Oh, it’s probably okay”), which can be an expensive mistake. A handier solution is to make up a water quick-connect assembly with integral gauge. Here’s all you need, available from any local hardware store or on Amazon: • Water pressure gauge • Water manifold Y-fitting with shut-off valves • Short flex-line “hose-saver” Attach the Y-fitting female to the flex-line and then to the city-water faucet. The flex-line allows attaching the setup to even the most inaccessible faucet. Then the water pressure gauge attaches to one of the Y-fitting male outlets and your water hose […]