The complete diaphragm repair kit from Udor includes everything you will need to fully restore your KAPPA 33/43/53 pumps. You have come to rely on it, so make sure it continues to operate how it was made to. The kit includes three piston diaphragms, diaphragm bolts, diaphragm washers, valve assemblies, and O-rings. Using the pump when it is worn out may cause damage, so replace the wearable pieces to keep it working right.