Per the manufacturer there are several kits available for the Hypro 9910-D30GRGI Diaphragm Pump. They offer a diaphragm kit, valve kit, and an o-ring kit. They suggested you visit their webiste, and take a look at these kits to see which one would fit your needs. At that point, you would need to contact us via phone and let us know which part it is, and we can get that for you as an authorized supplier. Please visit their site at http://www.hypropumps.com/EngineeredSearchResults.aspx?Term=d30grgi, and check under the parts list.