1-1/4" Sweat RaVent Jr. Spiral Air Eliminator RAV-SP114S

From Manufacturer:

• Simple to Install with a Atraight In-Line Design 
  
• Designed for Radiant Heat and Hydronic Systems 
  
• Solid Brass Body Construction for Extended Service Life 
  
• Traps Smallest Microbubbles with Little Resistance 
  
• Spiral Tube Vent Eliminates Air from the System Fluid 
  
• Specially Constructed Air Chamber to Protect the Valve Mechanism from Dirt 
  
• Unique Valve Mechanism is Guaranteed Not to Leak and Cannot be Shut Off 
• No Venting Required 
  
• Dirt and Leak Resistant 
  
• Quiet Operation 
  
• 1-1/4" Sweat Connection 
  
• Max Pressure 150 PSI 
  
• Max Temperature 270°F