Hypro Leather Cup Repair Kit for 5210C and 5210C-H Piston Pumps - 3430-0037 Hypro3430-0037 Leather Cup Repair Kit For the Hypro 5210C and 5210C-H Piston Pumps. Also works on the 5206C and 5206C-H models as well Kit includes 2 of the following items: Leather Cups (# 2150-0001), Piston Cap Screws (# 2220-0013), Washers (# 2270-0012), O-Rings (# 1720-0030), O-Rings (# 1720-0065), Seal Rings (# 1440-0012)