Armstrong DD-4 Combination Steam Trap and Condensate Pump

Armstrong Combination Steam Trap & Condensate Pump (Double Duty Pump)

The very best product to handle stall in steam system
(stall can create the condensate flooding inside the steam heating equipment
in the end it will create corrosion & water hammer in the steam heating system)

The Steam trap & Condensate pump trap are build-in  inside one body

No need to have a separate steam trap in a closed loop of condensate return system
(especially installed at the closed circuit of a condensate return system)

PLEASE WATCH THE VIDEO OF HOW STALL HAPPENS HERE !