part 31485 O-Ring, Front Cylinder, Smaller Cat Pumps code 31485 Details Cat Pumps number31485 DescriptionO-Ring, Front Cylinder, Smaller Qty per pump3 Also comes in 76810 Seal kit, NBR (STD)76820 Valve kit, NBR (STD) Fits these pumps Cat Pumps 18 Frame block-style 1 1810