Designed with a single pole double throw (SPDT) configuration

whereas a 1-pole unit always keeps one leg energized (hot)

This Emerson Alco 030620 Valve is a 2-way normally closed solenoid valve designed for demanding industrial fluid control

Field Serviceable: Features a modular design allowing for rapid cleaning of the stainless steel strainer without removing the valve body from the line

Siemens Building Technology 331-2973 Kit 320720-756 Designed with a single poleThe Siemens 331 2973 is a rugged, metal fabricated No. 4 pneumatic damper actuator designed for the gradual or positive control of HVAC systems and fire smoke dampers. Built for high demand applications, this piston type actuator features a 4 inch stroke and a nominal 8 13 psi spring range, ensuring precise positioning of ventilating systems and mixing boxes. This universal kit includes a mounting plate, pivot post, clevis, and damper crank,