Amtrol® 443-1 Air Purger, For Use With 700 Series Automatic Air Vents and Extrol® Expansion Tank, 125 psi, Cast Iron, Domestic

AM443 MFG #: 443-1
  • Country of Origin: US
  • Dimensions: 6 in L x 2-1/2 in W x 4 in H
  • Domestic/Import: Domestic
  • Manufacturer Name: Amtrol
  • Specifications: 125 psi
  • Suitable For Use With: 700 Series Automatic Air Vents and Extrol® Expansion Tank
  • Features and More


  • The water that is used initially to fill a hot water heating system contains dissolved air
  • Make-up water subsequent added will similarly have a high air content
  • Heating this water releases the air and permits it to be circulated in the system, for which it must be vented
  • The purpose of the air purges is to continuously separate and collect any air from the water as it circulates so that it may be vented automatically by afloat air vent without the necessity for frequent manual venting
  • System connection sets the point of no pressure change
  • 1 in connection
  • 1/8 in NPT top connection
  • 1/2 in NPT tapping
  • Low lead IAPMOR&T


  • Separates air from water in closed loop hydronic heating systems


  • ISO 9001-2008