part 23172 O-Ring, Adapter, Outer Cat Pumps code 23172 Details Cat Pumps number23172 DescriptionO-Ring, Adapter, Outer Qty per pump6 Also comes in 76830 Kit, Seal (Includes: 101, 106, 133, 152, 159)76835 Kit, Valve (Includes: 152, 159, 164, 166, 167, 168) Fits these pumps Cat Pumps 2SFP 1 2SFP500EL