service kit: seal kits 31628 Seal kit, FPM (.0110) Cat Pumps code 31628 In the kit Part numberDescriptionPosition 48394O-Ring, Plunger Retainer98 14329O-Ring, Seal Case121 Kits per pump: 1. Fits these pumps Cat Pumps 5CP 5 5CP2120W5CP2140WCS5CP2150W5CP61205CP6120CS