Bell & Gossett Aquastat, 115/120VAC, 60 HZ Operation
Designed to thermostatically turn any B and G NBF circulator ON and OFF. The AQ-1/2 or AQ-3/4 will switch the pump OFF at 120 deg F (48.9 deg C) and ON at 100 deg F (37.8 deg C). The aquastats are available in separate models that will sense the temperature for either 1/2 in or 3/4 in copper pipe.