AR20081 | Gymatic 3/B Unloader Valve 3650 PSI System Relief

AR20081 Gymatic 3/B Unloader | 3650 PSI, 3 to 5.5 GPM, Fixed 1.8 mm Injector

The AR20081 is the Annovi Reverberi Gymatic 3/B unloader for RK, RR and XM series pumps, rated to 3,650 PSI at 3.0 to 5.5 GPM. It bolts straight onto the pump and controls pressure: 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.

A fixed 1.8 mm chemical injector is built in, so you can draw detergent through the machine without adding a separate injector.

What It Fits

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

How to Use the Injector

• The injector draws detergent only at low pressure. Switch to a low-pressure soap nozzle to pull chemical.
• Flush it with clean water after each chemical job to prevent residue and blockages.

Good to Know

• This is a trapped-pressure unloader: when you release the trigger, pump pressure drops to zero but the hose stays pressurized. That gives a quick restart.
• Set the working pressure with a gauge, and keep a thermal relief valve on the pump to protect it during long bypass periods.
• Need a different injector size? The AR20082 is the same Gymatic 3/B with a larger fixed injector.

AR20081 Specifications

• Model: AR20081 (Gymatic 3/B)
• Max Pressure: 3,650 PSI
• Flow Range: 3.0 to 5.5 GPM
• Inlet: 1/2 in. male NPT
• Outlet: 3/8 in. male NPT
• Injector: Fixed, 1.8 mm
• 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.