The Tecmark 3015 pressure switch is designed for compatible applications that require a normally closed SPDT switch rated at 25 amps with a 1/8 inch threaded connection. Pressure switches are useful because they help confirm proper operating pressure before allowing the system to behave as intended.This replacement is especially useful when the original switch has become inaccurate, intermittent, or no longer changes state correctly with system pressure. Using the correct switch format helps preserve original control logic and mounting style.It is a practical service part when restoring dependable pressure-based control is important to heater or equipment operation. Tecmark 3015 normally closed SPDT pressure switch 25 amp rated with 1/8 inch threaded connection Helps restore pressure-responsive control behavior Useful when the original switch is inaccurate or failed Supports more dependable system operation