Manufacturer Name: Trane Product Number: CNT3520 OEM Part Number: CNT3520 Product Description: -.15"Wc Spdt Pressure Switch Weight:0.25lbs/113.4g The Trane CNT3520 is a vital component of many HVAC systems, serving as a dependable pressure switch. This single-pole, double-throw switch, which is normally designed to activate at a certain point of -0.15 inches of the water column... https://www.partshnc.com/15wc-spdt-pressure-switch-5