Direct-acting, float-actuated pneumatic liquid level control for valves or relays in heating systems with a 1/8" FIP input/output connections and a 1" FIP water connection. Two gauges are provided for supply air pressure (20 psi) and output air pressure (3-15 psi). This liquid level control provides an air pressure signal proportional to the liquid level and has an operating range of 1"-2". Its maximum pressure is 250 psi.
