These Size 0 diaphragms are 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
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