This 1-1/2 inch bronze boiler pressure relief valve is factory-set at 30 PSI

The sensing bulb must be securely strapped at the 12 o'clock

with yellow indicators for tenths and hundredths

making it a vital investment for professional HVAC maintenance and system restoration

technicians should verify the condition of the 69-113 and 69-114 o-rings during installation

Venstar VST3900 Thermostat 322027-701 This 1-1/2 inch bronze boilerThe Venstar VST3900 is an enterprise grade programmable thermostat designed for high performance multi stage HVAC systems. As the direct replacement for P374 1500 and P374 1900 legacy units, it offers backward compatibility while upgrading system control. This 7 day programmable digital thermostat supports 3 heat and 2 cool stages, making it compatible with gas electric or heat pump systems, including those with auxiliary heat. Field technicians value