York S1-3030-3791 Relay the sensor has failed to
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the sensor has failed to close and must be replaced
The 22-143 check valve tee is designed to thread directly onto the upper port of the 22-120 socket
As a genuine Armstrong repair part
preventing the common failure point of intermittent operational modes
York S1-3030-3791 Relay the sensor has failed toYork S1 3030 3791 24V Lockout Relay