Ideal for residential and light commercial zoning systems

For third-party 2-inch tube style neutralizers

The "/U" suffix simply denotes a universal retail-packaged version of the exact same technical specification

High Pressure Rating: Rated for 600 psi body pressure and 200 psi close-off pressure

The unit includes an integrated enclosure cover that accepts 1/2" conduit

Siemens Building Technology 544-643A Tool 318973-401 Ideal for residential and lightThe Siemens Building Technology 544 643A Pass Key is a vital TEC room unit configuration tool designed for senior technicians and HVAC contractors managing complex building automation systems. Built for field reliability, this room sensor configuration tool provides the hardware interface necessary to program, calibrate, and troubleshoot Siemens Series 2000, 2200, and 2300 room sensors. It streamlines the commissioning process by allowing direct