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the 2781S is often identified as a Torque Box actuator
Johnson Controls T46JEA-1 Fan Coil Thermostat
Its slender body design allows for effortless installation with deep-socket wrenches in tight mechanical spaces
including the M9000 and pneumatic options
the internal diaphragm is likely ruptured or worn and requires replacement with the D-251-6000
Armstrong International D503157 Air and Gas Vent Refrigerant the 2781S is often identifiedThe Armstrong International D503157 Air and Gas Vent is a high performance Series 21AR Cast Iron Fixed Pivot Ball Float designed for the efficient removal of air and gases from pressurized liquid systems. Engineered with a 1 2" NPT connection and a precision 5 64" orifice, this unit is built to manage a maximum operating pressure of 133 PSI. It is technically identical to the 21 AR 1 2 133 model, providing a robust solution for preventing air binding