Key Specifications / Parameters Part Number: 2N126902202 Product Type: Diaphragm for pneumatic actuator (Type 657, Size 70) Material: Nitrile elastomer (commonly called NBR) Actuator Size Compatibility: Size 70 (also referred to the Type 657 actuator, size “70/87”) Physical Size: Approximate diameter 21‑1/8 inches (~537 mm) with 28 mounting holes (per aftermarket listing) Application: Replacement part for Fisher Size 70 pneumatic actuator units in industrial valve assemblies Status: Listed as replacement/aftermarket part and may support legacy builds
