If your system requires signaling for a pump or boiler start

Extended Lead Length: 48-inch wiring leads provide ample reach for integration with standard contactors and terminal blocks

it provides critical overpressure protection for residential and light commercial boilers

How do I identify if I need the gray or violet thermistor

Honeywell MS4104F1210 Actuator 326070-701 If your system requires signalingThe Honeywell MS4104F1210 is a high performance Fast Acting Actuator engineered specifically for fire and smoke applications. This 120 Vac spring return actuator delivers 30 lb in of torque, ensuring reliable fail safe operation in critical life safety systems. Designed for precise two position control, it handles UL555 and UL555S requirements for leakage and fire ratings. This model features a 95 degree stroke and is compatible with a 1 2 inch round