While it serves as a standard 3/8" liquid valve

Utilizing an opposed blade design

As a critical genuine Reznor replacement part

providing linear heat output and preventing system instability

Cleveland Controls NS2-1087-00 Pressure Switch 321894-709 While it serves as aThe Cleveland Controls NS2 1087 00 Pressure Switch is a critical safety component engineered for precision air pressure monitoring in high efficiency HVAC systems and industrial process controls. This diaphragm operated air pressure sensing switch features a factory calibrated fixed set point of . 05" W. C., making it an essential replacement part for furnace draft inducer proving circuits and ventilation flow verification. Built with a rugged housing