Fitment The AR2119 Gymatic 3/B series of unloaders mounting kit for XM and RK series unloaders from Annovi Reverberi that operate at 3650 PSI and below. Build to Last Constructed from high standard forged steel for strength, durability, and longevity; coated with black and gold oxide finish for resistance to rust and corrosion. Widely Application Used on various High Pressure Triples Plunger Pumps for AR North America, including pressure washer pumps, misting pumps and Blue Clean pressure washing equipment. Replacement Replaces OEM gymatic mounting bolt kit AR-2119 and has OE standard quality and performance, works easier and save your money. .