AR20477 | Gymatic 3/B Unloader Valve 3650 PSI Compact Body

AR20477 Gymatic 3/B Unloader | 3650 PSI, 3 to 5.5 GPM, Adjustable Knob

The AR20477 is the Annovi Reverberi Gymatic 3/B unloader with an adjustable pressure knob, for RK, RR and XM series pumps. It is rated to 3,650 PSI at 3.0 to 5.5 GPM. It bolts straight onto the pump: when the trigger closes, it sends flow to its built-in bypass so the pump is not dead-headed. No external bypass hose is needed.

Turn the knob to set working pressure: lower for siding, wood and paint, full pressure for concrete and equipment. With no chemical injector in the valve, there is one less part to clog, and detergent can be applied downstream or not at all.

What It Fits

• Pumps: Annovi Reverberi RK, RR and XM series, including the A and V versions.
• Flow: 3.0 to 5.5 GPM.
• Pressure: up to 3,650 PSI.
• Connections: 1/2 in. male inlet, 3/8 in. male outlet.

Not sure it fits? Text a specialist at (505) 226-6061 with your pump model and a photo of the old unloader and we’ll confirm.

Good to Know

• This is a trapped-pressure unloader: when you release the trigger, pump pressure drops to zero but the hose stays pressurized.
• Set the working pressure with a gauge at the pump outlet, and keep a thermal relief valve on the pump to protect it during long bypass periods.
• Need detergent through the machine? The AR20081 and AR20082 add a fixed chemical injector, and the AR20399 adds an adjustable one.

AR20477 Specifications

• Model: AR20477 (Gymatic 3/B)
• Max Pressure: 3,650 PSI
• Flow Range: 3.0 to 5.5 GPM
• Inlet: 1/2 in. male
• Outlet: 3/8 in. male
• Pressure Adjustment: Knob
• Injector: None
• Bypass: Built in
• Body: Brass
• Max Water Temperature: 140°F
• Fits: AR RK, RR and XM series pumps
• Brand: Annovi Reverberi

Shipping: Usually ships via UPS in 1 to 3 days.