Sensus 046-00-021-00 Spring the switch is defective and

the switch is defective and needs immediate replacement

this is often called a 2" nominal fitting

oil-filled aluminum case with a patented pressure-sensitive interrupter (PSI) for safety

Industrial Grade Material: Resilient to the thermal cycling and acidic condensate common in modern HVAC/R heating systems

The Lennox 47K18 Rollout Switch is a critical safety component engineered for forced-air furnaces and industrial heating systems

Sensus 046-00-021-00 Spring the switch is defective andThe Sensus 046 00 021 00 Spring is a critical calibration component designed for the Sensus Model 046 field regulator series. Engineered for high pressure service, this Yellow Spring provides a precise outlet pressure range of 3 10 psi, making it the standard choice for "pounds to pounds" regulation in farm taps, gas blanketing systems, and industrial air or gas applications. This specific part is physically identical to the Sensus 04600 021 00,