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the 1172504 supports both frequencies
the 14-B ball-type valve is the modern replacement for older spring-actuated blow-off valves used on the 47 and 67 series controls
Rugged Construction: Built to withstand the thermal cycles common in high-demand residential and commercial heating units
For heat/cool applications
Hydrolevel 170 Low Water Cut-Off Els PW 17895 the 1172504 supports both frequenciesThe Hydrolevel 170 Low Water Cut Off is a heavy duty electronic safety control engineered for 120Vac hot water boiler applications. Designed specifically for the heating professional, the Safgard 170 (Part Number 45 170) utilizes the EL1214 sensing probe to monitor water levels without the mechanical failures associated with traditional float style devices. This unit features an automatic reset function that interrupts power to the burner immediately
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