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Key Benefits Direct OEM Compatibility: Serves as a 1:1 drop-in replacement for the 18K4401
For 7-ton systems with larger suction lines
For contractors managing large-scale maintenance
the 1/2" G-ports allow it to function as a standalone manual isolation valve in any pneumatic line
Automatic System Recovery: Integrated automatic reset boiler control restarts the burner once the water level covers the probe
Resideo ZD16X12TZ Damper 30067439-890 Key Benefits Direct OEM Compatibility:The Resideo ZD16X12TZ Damper is a professional grade, 24Vac powered HVAC zone damper specifically engineered for high performance residential and light commercial zoning systems. As a veteran preferred rectangular zone damper, it features parallel blade action and a power closed spring return open fail safe configuration, making it the ideal choice for zones requiring a normally open default state. This 16" x 12" unit is built with a heavy duty
