As a single-pole double-throw (SPDT) switch

this SPST switch provides the electrical reliability needed to prevent nuisance tripping and common pressure switch stuck open codes

the internal bi-metal disc has likely failed and the component requires replacement

Key Benefits Precise Compatibility: Specifically designed for seamless operation with Parker Flo Con A8 and A9 regulator valves

while the water-resistant case allows for vertical mounting in areas exposed to minor environment vibration or moisture

MAMAC Systems PR-275-R2-VDC Pressure Sensor Els PW 17895 As a single-pole double-throw (SPDT)The MAMAC Systems PR 275 R2 VDC is a high precision differential pressure transducer designed for critical building automation systems. This unit features a micro machined glass on silicon (Gl Si) capacitance sensor, eliminating common issues like zero drift and calibration shifts from overpressure. As a professional grade low pressure sensor, it offers exceptional stability for monitoring duct static pressure, filter status, and cleanroom