What is the difference between the 305930 and the 305930/U

this valve is internally calibrated and ported specifically for R-410A pressure-temperature logic

The Heil Quaker ICP 1192932 Pressure Switch is a critical safety component designed for high-efficiency furnaces and HVAC systems

Standard Fitment: Utilizes 3/8" O

Whether you are performing a hydronic heating system repair or a new HVAC valve installation

Siemens Building Technology 331-2929 Actuator 319848-301 What is the difference betweenThe Siemens 331 2929 Actuator is a heavy duty No. 4 pneumatic damper actuator designed for professional HVACR installations requiring high torque performance. Featuring a 3 7 psi spring range and a standard 4 inch stroke, this unit is engineered for the gradual or positive actuation of large dampers, mixing boxes, and terminal unit air valves. Built with a rugged, all metal body and a replaceable EPDM rolling diaphragm, this pneumatic damper actuator