Water & plumbing
Set the right water pressure (and why you still need a regulator)
The ideal water pressure for most RVs is 45 to 50 PSI. Modern PEX plumbing can technically handle more, but staying in that sweet spot keeps the flow strong while protecting plastic fittings, older pipe joints, and appliance valves from bursting.
Airstream factory settings
- Built-in regulator Most modern Airstreams have an internal water pressure reducing valve at the city water inlet, factory-set to limit incoming pressure to 50 PSI (some older models ran 65 PSI).
- Onboard water pump When you are boondocking off the fresh tank, the internal pump pressurizes the lines to about 55 PSI before it shuts off.
Why you still need an external regulator
- Hose protection Even with a built-in regulator, a campground spike (easily over 100 PSI) can burst your drinking-water hose before the water ever reaches the trailer's regulator.
- Alde system care If your rig has an Alde hydronic heating system (common in Classics and Basecamps), its overpressure relief valve is sensitive. A pressure spike makes it open and constantly dump water under the trailer. An external regulator set to 40 to 45 PSI prevents this entirely.
Dialing it in
- Skip the cheap plastic inline regulators They restrict your actual flow volume. Use a solid brass adjustable regulator with a gauge instead.
- Set it at the spigot Hook the regulator directly to the park spigot, watch the dial, and adjust it manually to 45 PSI before you screw in your hose.
Helps to have on board
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Use this tip