part 9.851-520.0 Set screw stei M6 x 6 Hawk code 9.851-520.0 Details Hawk number9.851-520.0 DescriptionSet screw stei M6 x 6 ItalianVITE STEI M6X6Qty per pump1 Fits these pumps Hawk NPM-GR 3 NPM1328GRNPM1428GRNPM1728GR