When you need to repair your Comet MP20 or MP30 Diaphragm Pump, make sure you have this 5026.0080 MP20/30 Diaphragm & Valve Kit on hand. This product includes all the parts you need to swap out damaged or faulty pieces, including one accumulator diaphragm, two flat gaskets, nine O-rings, two piston diaphragms and four valve assemblies.