The Honeywell 313745 Silicone Diaphragm is designed for use with MP953A, MP953C, and MP953E pneumatic actuators. It measures 5 inches in diameter and is built to endure high-temperature applications, withstanding up to 250°F (121°C). Made from durable silicone, it offers excellent flexibility, chemical resistance, and long-term reliability. https://www.partshnc.com/mp953ac-5-250f-silicone-diap-2