service kit: plungers KIT 151 Plunger kit Udor code 6061F9 In the kit Part numberDescriptionQty 0301663 0303483 1101H93 Fits these pumps Udor CH 1 CHC 20/50 S Udor CX 4 CXC 18/50 SCXC 22/50 SCXD 3.5/75 SCXD 6.0/75 S