Johnson Controls V 4710 604 Diaphragm R 410A High Side Protection: Reliable close high High Side Protection: Reliable close high open low action for active fan cycling control and pressure limiting The Nordyne 626350R Roll Out Switch is a critical SPST safety component designed for gas furnace flame rollout protection It is constructed from a robust synthetic elastomer or high grade rubber designed to resist the wear and thermal stresses common in pneumatic HVAC systems The Johnson Controls V 4710 604 Diaphragm is a professional grade 16 1 2" diameter replacement diaphragm specifically engineered for high capacity 8R series pneumatic valve actuators