About This Item 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 Direct Replacement -- Replaces OEM gymatic mounting bolt kit AR-2119 and has OE standard quality and performance, works easier and save your money 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 .