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1-AV Cast Iron Air Vent

The Armstrong 1-AV Cast Iron Air Vent provides automatic air venting for steam heating systems. The thermostatic element automatically vents air and non-condensable gases while preventing steam loss. Efficient air removal is critical for proper heat transfer.

The compact cast iron body is designed for long service life in commercial and institutional heating systems.

Key Features

  • Automatic air venting — no manual operation required
  • Thermostatic element prevents steam loss
  • Cast iron body for durability
  • Compact design for easy installation
  • Improves heat transfer efficiency

Applications

Essential for steam heating systems including radiators, heat exchangers, and steam mains where trapped air reduces heat transfer efficiency.

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  • Brand
  • Connection Type
  • Connection Size
  • Maximum Operating Pressure (PSI)
  • Orifice Size (In.)
  • Body Material
Terms and Conditions
30-day money-back guarantee
Shipping: 2-3 Business Days
Connection Size 1/2″ (15 mm), 3/4″ (20 mm)
Connection Type Screwed NPT
Body Material ASTM A48 Class 30 Cast Iron
Maximum Operating Pressure (PSI) 146, 173, 219, 300
Orifice Size (In.) 1/8", 7/64", #38, 5/64", #38"
Brand Armstrong International
Brand: Armstrong International
Connection Type: Screwed NPT
Body Material: ASTM A48 Class 30 Cast Iron