the 1003442 is the official manufacturer update for the 904799

as generic parts may not provide adequate protection

For technicians servicing Lennox LGA036H series units or similar packaged rooftop units

Does this tool support the AK-SM 800 series system managers

Can I use this valve to replace a 1

Dwyer Instruments 1638-10 Pressure Switch 321042-401 the 1003442 is the officialThe Dwyer Instruments 1638 10 Pressure Switch is the commercial standard for high precision monitoring of air and non combustible gases. Engineered with a large diaphragm, this Series 1630 switch provides the low range accuracy required for critical HVAC duct air control and damper positioning applications. It operates within a 3" w. c. to 12" w. c. range with a 0. 11 0. 30 approximate deadband, ensuring a reliable differential pressure response