Part Number: 8.712-573.0 Cross Reference Part Number(s): 462243, 5-3206, 723134, 87125730 Manufacturer’s Part Number (MPN):AR20890 This 8.712-573.0 Annovi Reverberi Mini-Matic Bolt On Unloader is designed for use with AR Pumps in the RC, XT and XM Series, and is rated for 2600 Max PSI. This pressure regulator unloader has an aluminum bypass with a 2.0mm Adjustable Detergent Injector. Rated for 2 to 3.0 GPM, with a 1/2″ F Inlet and 3/8″ M Outlet.