Armstrong 71K11 Pressure SwitchArmstrong 71K11 is a premium SPST pressure switch designed for HVAC and industrial control applications. The LB 90973A SPST Pressure Switch features a 1 4" connection and a precise. 75 W. C. setting for reliable pressure regulation. Engineered for dependable performance, this Armstrong switch delivers quick response, stable switching, and excellent repeatability in challenging environments. It blends seamlessly with standard control panels and is

Type: Poppet

Pipe Size: 1-1/4 inch

reliable circulation

15-second valve-on delay time ensures controlled fuel flow

Ideal for homeowners and technicians performing repairs

Ideal for HVAC applications

it features a NEMA 48 frame

helping to maintain efficiency and reduce costly downtime over the heater’s service life

It supports easy installation

operating -30 to 40 °F

it fits standard Beckett S assemblies without modification

efficient cooling