Armstrong D13889 Vent Valve Kit DD4 for DD-4 Pump Trap

Armstrong part D13889: vent valve kit dd4 for the Armstrong DD-4 pump trap (Double Duty ® DD-4 Steam Trap and Pump Combination).

Armstrong Double Duty ® DD-4 Steam Trap and Pump Combination: pump trap from Armstrong International. See the manufacturer documentation linked below for specifications.

Manufacturer documentation for the Double Duty ® DD-4 Steam Trap and Pump Combination: data sheet, installation and maintenance manual.