A compact, demand-activated diaphragm pump built for RV fresh water systems, liveaboards, and marine applications. The Camco 22491 delivers 3.0 GPM at demand with automatic 55 PSI cutoff, self-priming capability, and run-dry protection -- everything you need to keep water flowing from tank to tap without a pressure regulator on the supply side.
The Camco 22491 is an automatic demand diaphragm pump designed to replace or upgrade the factory fresh water pump in most Class A, B, and C motorhomes, fifth wheels, travel trailers, and marine vessels. It pulls water directly from your onboard fresh water tank and delivers pressurized flow to every faucet, shower, and toilet in the rig -- all without city water hookup.
The variable flow design means output adjusts to demand automatically. Crack a faucet halfway and the pump modulates; open it fully and flow ramps up. When you close the tap, pressure builds to the 55 PSI cutoff and the pump shuts off cleanly. No short-cycling, no hunting -- just steady, quiet pressure.
Pump starts and stops automatically when flow is detected. No manual switches or float valves required at each fixture.
Modulates from low trickle to full 3.0 GPM based on system demand -- gentler on fittings and more efficient at partial use.
Primes from dry against a vertical lift typical of RV tank placements -- no manual priming or foot valve needed on initial startup.
Safe to run without water for extended periods, protecting the pump when the fresh water tank runs low or empties unexpectedly.
Traditional fixed-speed RV pumps run at full output or not at all, which causes noticeable pulsation at low flow rates and can stress fittings over time. The Camco 22491 variable flow design adjusts motor speed to match actual demand, which means:
The 22491 can self-prime from a dry start across the vertical lifts typical in RV fresh water plumbing. Once the inlet line is connected to your fresh water tank and the pump is wired to 12V DC, it will pull water up and prime itself automatically on first use. No priming plug, no foot valve, no hand-filling the inlet line.
The Camco 22491 is designed for straightforward drop-in or new installation in RV and marine fresh water systems. Standard connections keep the job simple:
While the variable flow design reduces pulsation significantly compared to fixed-speed pumps, pairing the 22491 with a small accumulator tank (typically 0.5 to 1.0 gallon) further smooths pressure, reduces pump cycling, and extends pump service life. Accumulators are especially worthwhile in full-time RV use or on longer trips where the pump runs frequently throughout the day.
The Camco 22491 is rated for potable fresh water service only. Do not use this pump to transfer grey water, black water, fuel, chemicals, or any fluid other than clean fresh water. Running abrasive or corrosive fluids will damage the diaphragm and void any warranty claim.