This SPST pressure switch features an "open on low" configuration

Key Benefits for the Contractor: Precise 3-Inch Fit: Optimized for Lochinvar 3 inch flue assemblies to ensure a drop-in replacement without field modifications

Professional-Grade Build: Features a high-integrity brass body and brazed connections for maximum 500 PSI operating pressure resistance

preserving the equipment’s BTU output and operational efficiency

Industrial Grade Durability: Heavy-duty cast iron body construction withstands rigorous temperature cycling and high-pressure steam environments

Trane SWT3372 Pressure Switch 320788-703 This SPST pressure switch featuresThe Trane SWT3372 Pressure Switch is an essential safety component designed for precise refrigerant monitoring in Trane and American Standard HVAC systems. Functioning as a low pressure cutout switch, this part is engineered to open the electrical circuit when system pressure drops below its calibrated setpoint, protecting the compressor from damage due to loss of charge or restricted flow. Specifically identified by technical designations such as