The Tecmark 3035 pressure switch is designed for compatible applications that require an SPNO switch rated at 25 amps with a 1/8 inch NPT connection and a 1 to 10 PSI range. Pressure switches with a defined operating range are useful because they help preserve the original pressure response characteristics of the system.This replacement is especially useful when the original switch no longer responds within the intended pressure window, becomes unreliable, or has failed completely. Matching both the connection type and pressure range helps keep the replacement closer to original design intent.It is a strong service choice when pressure-specific switching is important to proper heater or control performance. Tecmark 3035 SPNO pressure switch 25 amp rated with 1/8 inch NPT connection 1 to 10 PSI pressure range Useful when the original switch is inaccurate or failed Supports more precise and dependable pressure control