AR2119 Gymatic 3/B Unloader Mounting Bolt Kit for Annovi Reverberi XM RK Series Features: 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. .