part 9.851-157.0 Spring washer Ø8.1/12.7 x 2 Hawk code 9.851-157.0 Details Hawk number9.851-157.0 DescriptionSpring washer Ø8.1/12.7 x 2 ItalianROSETTA ELASTICA Ø8.1/12.7X2Qty per pump4 Fits these pumps Hawk NPM-GR 3 NPM1328GRNPM1428GRNPM1728GR