Complete kit - includes: one diaphragm, two valve assemblies, and two sealing washers (these are all the rubber parts for one pump).
Available in nitrile, or Hypalon, Viton by special order.

Nitrile (Buna N) is a strong all purpose material good for oily water, sewage, dewatering and general waste water applications
Hypalon is good for similar applications as nitrile, but is best in applications where the outer surface of the diaphragm is exposed to ozone from electrical devices, or exposed to sunlight regularly.
Diaphragm dimensions: 10-1/4" OD; 1-13/16"H from base to outer flange; 3-7/8" C/C drive arm attachment bolt holes
If necessary, check appropriate chemical compatibility charts to determine which to order
Note - these kits are for side inlet pumps