FILTERUP AR42940 Pump Head Assembly for AR/RMW Pressure Washers — 2600 PSI, 2.2 GPM with Unloader & Thermal Relief

FILTERUP AR42940 is a replacement pressure-washer pump head assembly that includes an unloader and an installed thermal relief valve, engineered to restore up to 2600 PSI and 2.2 GPM performance.

If your Annovi Reverberi–style pressure washer is producing weak spray or leaking at the head, swapping in a complete pump head assembly can bring back reliable cleaning power. The AR42940 is built to fit a wide range of AR/RMW series pumps and arrives with an integrated unloader for safe pressure diversion and a thermal relief valve to help avoid overheating during intermittent use. This listing explains compatibility, installation basics, and how to confirm this head is the right replacement for your machine.

Which machines will this FILTERUP pump head work with?

The AR42940 is designed for selective Annovi Reverberi-style models. Check your pump model number (usually stamped on the pump body) before ordering to ensure fitment.

• Compatible: RMW2G20, RMW2.2G24, RMW2G23B, RMW2G24, RMW2G25, RMW2.2G20D, SRMW2.2G26.
• Not compatible: SRMW 2.4 GPM, SRMW2.3G28, SRMW2.4G28, SRMW2.5G28 models — confirm model differences before purchase.
• Physical check: compare inlet/outlet locations and bolt pattern to your existing head for a quick match.

How does the unloader and thermal relief valve protect my pump?

The factory-installed unloader reroutes pressure when the spray gun is closed, reducing shock to valves and seals; the thermal relief valve helps release hot water buildup to limit heat-related stress. Together they reduce wear during normal on/off operation and when idling with the trigger closed.

• Unloader: diverts flow to bypass, preventing overpressure spikes.
• Thermal relief valve: opens if water temperature or pressure reaches unsafe levels.
• Outcome: smoother cycling and extended component life under typical residential or light commercial use.

What performance can I expect after installing this pump head?

When matched to a compatible pump and engine, the AR42940 restores up to 2600 PSI and a 2.2 GPM flow rate, providing the pressure and volume needed for common cleaning tasks. Actual results depend on the motor, hose length, and nozzle selection.

• Maximum rated output: 2600 PSI at optimal engine RPM.
• Flow capacity: 2.2 gallons per minute for sustained cleaning power.
• Adjustable spray: use nozzle sizes and pressure adjustments to suit delicate or heavy-duty surfaces.

How difficult is installation and what should I prepare?

Installing the pump head typically requires basic mechanical skills and common hand tools. Turn off the engine, drain fluid from the pump, and reference your machine’s service manual for torque specs and sealant guidance.

• Tools: wrenches, thread sealant, replacement gaskets or O-rings as needed.
• Precautions: flush lines, ensure correct shaft alignment, and torque bolts evenly.
• Time: most users complete swap in about 30–90 minutes depending on access and experience.

Who is this for: FILTERUP AR42940 suits homeowners, mobile detailers, rental shops, and light commercial users who need a direct-replacement pump head for compatible Annovi Reverberi–style pumps. Buy this assembly if you want a quick repair that includes both an unloader and thermal relief valve, restoring solid pressure and safer operation without sourcing separate components.