The Udor Diaphragm Repair Kit 8700.45 can be used to fix and repair the diaphragms on your existing Udor Kappa 33, 43 or 53 diaphragm pump. The kit comes with 3 Desmopan Diaphragms (0903.50) and 6 Valve Assembly O-Rings (1101.27). ** Please note that the Udor Kappa 33 has been discontinued, so use the Udor Kappa 43 as an alternative.