Camco 40143 Water Pressure Regulator, Plastic 40-50 PSI

City water at a campground or marina is a gamble. One hookup runs a gentle 45 PSI, the next one down the row is pushing 90 or more, and your RV or boat plumbing has no idea what's coming. The Camco 40143 fresh water pressure regulator sits inline between the spigot and your fresh water hose and knocks that incoming pressure down to a steady, safe 40 to 50 PSI. Thread it on, hook up your hose, and stop worrying about what the water system on the other side of that faucet is doing.

Here's why it matters. Most RV and boat plumbing, the fittings, the flexible lines, the water heater, is built for moderate pressure. Hit it with a spike and you get blown fittings, split hoses, a weeping relief valve, or a failed connection behind a wall you can't easily reach. This little regulator is cheap insurance against all of that. We've seen plenty of soggy cabinets and ruined weekends that a part this cheap would have prevented.

The 40143 is the plastic version, molded from durable ABS. It's preset from the factory, so there's nothing to adjust and nothing to fiddle with. You don't dial in a number, you just let it do its job. That preset design is part of what keeps it simple and affordable. It attaches to standard 3/4-inch garden hose threads, the same thread you'll find on your fresh water fill hose and the campground or dock spigot, so it drops right into the line without any adapters for most setups.

This one ships without a gauge. That means you won't see a live pressure reading, but the regulator still caps the flow to that safe 40 to 50 PSI range the same way the gauge models do. If you want to actually watch the pressure, or you want a higher flow rate for a big rig with a long run to the back of the coach, Camco also makes brass and with-gauge versions of this regulator. For most trailers, boats, and smaller motorhomes, the plastic no-gauge 40143 is all you really need.

Safety and water quality are covered too. The 40143 is CSA low lead content certified to NSF/ANSI 372 and complies with federal and state low-lead laws, so it's fine on the fresh water side that feeds your galley tap and shower. Maximum working pressure on the inlet is 125 PSI, and it's built for outdoor use, sitting out at the spigot rather than buried inside the bay.

Installation takes about ten seconds. Screw the regulator onto the campground or dock faucet first, then attach your drinking-water hose to the outlet side. Do it in that order and the regulator protects the hose too, not just the coach. When you break camp, unthread it, shake it out, and toss it in with your winterizing and hookup gear. It stores small and there's no real maintenance to speak of. A quick rinse now and then is all it asks. No tools, no plumbing to cut into, and nothing to remember season to season.

One honest note on flow. Because it's preset toward the lower end and it's the compact plastic body, you'll get a moderate flow rate rather than a firehose at the tap. For a weekend camper or a boat topping off its fresh water tanks, that's plenty. If you're running a big motorhome with a long line to the back and you want stronger flow, that's where Camco's higher-flow brass models earn their keep.

Who's this for? First-time RV owners who just want their plumbing protected without thinking about it, boaters filling fresh water tanks at the dock, and anyone tired of playing roulette with unknown city water pressure. It's not an adjustable regulator and it's not a filter, so if you need to fine-tune pressure or clean the water, that's a different tool. But if you want a simple, proven, set-and-forget guard on your fresh water line, the Camco 40143 has been doing exactly that job for years.