ARO PE01P-HPS-PAA-AC0 Pump Part Exploded View Diagram & 1/4" Non-Metallic Compact Series Repair Parts PDF Manual. Solenoid Valve Block Service Kit: 637371-3-C & Mounting Adapter Plate Optional Accessory Kit: 24123879 Available. Replacement Diaphragm, Seat, Balls, O-Ring, Seal, Flex Check, Rod, Manifold, Washer, Bolt, Nut, Gasket, Fluid Cap, Center Body, Plate, Spool Assembly, Valve, Coil, Sensor.