ProSpray 3.21 27Item Part No. Description1 0509 594 Retainer2 0509 584 Piston guide3 ------- Upper packing4 0551 756 Transducer assembly5 0507 517 Pipe plug6 0290 209 Pump manifold7 0509 873 Fitting8 ------- Lower packing9 0552 489 Bushing10 0290 277 Piston rod11 0551 262 Upper cage12 0551 263 Crush washer13 50164 Outlet valve ball14 0551 620 Outlet valve seat15 13481 Outlet valve retainer16 0509 591 Lower ball guide17 0509 583 Inlet valve ball18 0551 534 Inlet valve seat19 0509 582 O-ring, Teflon20 0509 581 Inlet valve seal21 0290 216 Inlet valve housingItem Part No. Description22 9871 160 O-ring23 0508 748 Filter24 0508 603 Bearing ring25 0508 601 Filter housing26 0508 602 Conical spring27 0508 749 Bearing spring28 0508 604 O-ring29 0507 745 Gasket30 0558 727 Bypass valve assembly (includes item29)31 0507 931 Cam base32 0508 744 Relief valve knob33 5006 543 Groove pin34 9885 612 Return tube fitting0509 151 Piston assembly (includes items 10-15)0290 201 Repacking kit - 1 (includes items 2-3,8, 11-14 and 16-20).0558 728 Repacking kit - 2 (includes items 2-3and 8).0507 254 Relief valve kit (includes items 29-33).