Use a regulator, and set it to the pressure your RV's builder prints: the manuals read for this page say 40 to 60 psi, depending on the brand and the product line. Valterra's and Renator's adjustable regulators arrive preset at 45 psi, inside that range.
RV Water Pressure Regulators: Why You Need One and What PSI to Set
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At a glance
- What to set: builders print figures from 40 to 60 psi, and Valterra's and Renator's adjustable regulators come preset at 45 psi.
- Where it goes: on the campground spigot, with the hose and any filter connecting after it.
- Who can skip it: Airstream touring coaches already have a regulator built in, limited to 50 psi.
On this page (6)
Our picks
- Camco 40064 brass water pressure regulator with gauge: factory preset 40 to 50 PSI with a gauge; nothing to adjust
- Camco 40058 adjustable brass water pressure regulator: set with a screw in the cap; Camco advises staying at or below 60 PSI
- Valterra A01-1117VP adjustable water regulator with gauge: factory set at 45 PSI, adjusted with a flathead screwdriver
- Renator M11-0660R adjustable water pressure regulator with gauge: preset at 45 psi, adjusted with the screw on top of the cap
Do you really need a regulator?
Yes, unless your coach has one built in, because campground pressure can be higher than RV plumbing is built for. Keystone's 2027 owner's manual says always to use one; Jayco's says to consider one, "especially in mountain regions".
Grand Design names the failure: without a regulator on city water, the o-rings may fail. Airstream touring coaches have a regulator built in, limited to 50 psi, so they need no external one.
What PSI should you set?
Builders print different figures, so match your own builder's number rather than picking one you read elsewhere.
| Source | Pressure it states | Applies to |
|---|---|---|
| Grand Design | Regulator rated for 40 lbs. | Reflection travel trailers, Influence fifth wheels |
| Jayco | 45 lb. (315 kPa) rated regulator | 2025 Class C motorhomes |
| Winnebago | 50 psi max | 2026 motorhomes and camper vans |
| Winnebago | In-line 60 psi regulator | 2026 towables |
| Tiffin | Use a regulator if supply is over 60 psi | Zephyr, Allegro Bus motorhomes |
| Keystone | No figure, "always use" one | 2027 towables |
| Airstream | Built in, limited to 50 psi | Touring coaches |
Sources: Jayco 2025 Class C, Winnebago 2026 Minnie Winnie, Airstream support. Your figure is in the plumbing or fresh water section of your manual. Some appliances set their own ceiling: Truma's AquaGo caps at 65 psi and requires a pressure reducer on any supply above that.
Tip: One manual can print two numbers. Grand Design's Influence manual asks for a 40 lbs. regulator in the plumbing notice, while its Furrion tankless section says 35 to 70 PSI. The plumbing figure governs the whole coach; the appliance window belongs to that appliance.
Fixed or adjustable?
A preset regulator holds the factory setting with nothing to turn; an adjustable one has a screw on the cap and usually a gauge.
| Regulator | Set point | How it is set |
|---|---|---|
| Camco 40064, with gauge | Factory pre-set 40 to 50 PSI, max incoming 125 PSI | No adjustment screw listed |
| Camco 40058 | 40 to 50 PSI, above 60 PSI not recommended | Screw in the cap |
| Valterra A01-1117VP | Factory set 45 PSI, above 60 PSI not recommended | Flathead screwdriver |
| Renator M11-0660R, with gauge | Preset 45 psi, adjustable up to 160 PSI | Screw on top of the cap |
Camco and Valterra figures are from Camping World retailer spec pages, not the makers' own documents. Renator's are from its product page, which points owners to the RV manual for the setting.
Tip: A gauge with every tap closed shows standing pressure, which is the number to set by. Renator says a small drop with fixtures running is normal and depends on how many are open, so do not chase the lower reading with the screw. If the gauge sits above 0 psi while attached to nothing, slip a fingernail under the rubber stopper on top to vent it.
Where does the regulator go?
Put it on the spigot so the hose never carries full supply pressure. Renator's installation guide gives this order:
- Screw the regulator directly onto the spigot.
- Connect the hose to the regulator.
- Turn on the supply and flush the regulator and hose for one minute.
- Connect the hose to the RV's city water inlet and turn the supply back on.
- Open all fixtures to clear air from the lines.
- With every fixture closed again, turn the adjustment screw to the pressure you want.
Any filter goes after the regulator; see how RV water filters fit the same hose run. Jayco says only that the regulator goes between the source and the city water connection, not at which end. Use it too when filling the fresh water tank or flushing the black tank.
Weak pressure after hooking up
On city water, check the regulator first. A preset unit limits flow as well as pressure, and the inlet carries a screen that catches grit: unscrew the regulator from the spigot and rinse it. Valterra's adjustable regulator is listed at 14 to 15 gallons per minute at 45 PSI when nothing is blocked.
If pressure is weak only when running off the tank, the regulator is not involved. That is a pump question, covered on the RV water pump problems page.
Common questions
Do I need a water pressure regulator for my RV?
Yes, unless your coach has one built in. Without one, high campground pressure can reach plumbing that was not built for it.
What PSI should an RV water regulator be set at?
Your builder's figure, from your owner's manual. If you cannot find it, the 45 psi preset on Valterra's and Renator's regulators sits inside the range above, though Grand Design asks for 40 lbs.
Should the regulator go at the tap or at the RV?
Builders accept either, as long as it sits between the source and the inlet. The tap protects more, because the hose and filter then see regulated pressure too.
How do I adjust an RV water pressure regulator?
Turn every fixture off, then turn the screw on the cap, with a flathead screwdriver on Valterra's units, while watching the gauge. Camco and Valterra advise against going above 60 PSI.