Part Number: 8.712-582.0 Cross Reference Part Number(s): 462254, 5-3203, 723122, 87125820, 87154800, 906007 Manufacturer’s Part Number (MPN):AR20608 This 8.712-582.0 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. Rated for 3 to 5.5 GPM, with a 1/2″ F Inlet and 3/8″ M Outlet.