Bell & Gossett 113224 AQS-3/4 Aquastat is a 120V hydronic ball valve designed for temperature control in HVAC systems. This valve provides reliable on/off or modulating control for hydronic heating and cooling loops.

AQS Aquastats will thermostatically turn NRF/NBF pumps "On" and "Off". Using a stainless steel clip, which attaches to the surface of the copper pipe, it will sense the temperature within the pipe to turn the pump On/Off. Can also be used with B&G model TC-1 timer in combination to circulate water only when the time conditions are met and the temperature is low enough to cause the aquastat to switch "on".