Fabtek Aero stainless steel condensate pumps are designed to collect condensate and return it to the boiler, usually via a boiler feed tank and pump unit. As condensate flows to the receiver tank, it fills with water. The mechanical alternator then signals the motor on the pump to start and begin pumping the condensate. The mechanical alternator will alternate from one pump to the other pump during cycles. These compact, light-weight Fabtek Aero condensate units have tanks made from 12 gauge stainless steel with internal ribbing to add strength. The permanently-aligned pumps are also made of stainless steel and are equipped with a seal cavity bleed line. The 2520C4AB1D has a 1/2" connection and a 1/2 HP, 3450 RPM, 115v single phase motor with a semi-open impeller. The 2520C4AB1D is a duplex unit, with a 25 gallon tank, capable of pumping 22-1/2 gallons per minute at 20 psi and 15,000 EDR.