Answer
Jan 15, 2026 - 11:49 AM
The model numbers indicate the materials used in the pump's construction:
G57C212 models use Kalrez (FFKM) for the diaphragms and Viton Extreme for the seals.
G57S212A models use Santoprene for both the diaphragms and check valves.
Both pumps feature a polypropylene housing and Hastelloy springs.
