The CRL 5" (127 mm) Vacuum Cup Replacement Rubber Pad fits all 5" (127 mm) CRL Vacuum Cups. It is made of the same high quality rubber as the original supplied with the cup. Replaces easily by removing the pin and trigger assembly. To extend the life of the pad we recommend using CRL Glycerin. These cups were engineered to make the ordering of replacement parts as easy as possible.