Air vents for a variety of applications Automatic Steam Vent #7 1/8" FIP - 75 PSI Hydronic Air Vent $17.60 Automatic Air Vent #71 1/4" MIP - 150 PSI Hydronic Air Vent $20.70 Automatic Air Vent #75 1/2" FIP x 3/4"MIP - 150 PSI Hydronic Air Vent $25.80 Automatic Air Vent #78 1/8" MIP - 75 PSI Hydronic Air Vent $20.50 Automatic Air Vent #27 1/8" FIP - 50 PSI Horizontal Auto-Vent $17.65 Automatic Air Vent #37 1/8" MIP - 50 PSI Horizontal Auto-Vent $17.95 Automatic Air Vent #66 1/8" MIP, 50 PSI, 2 5/8" x 1 1/2", Vertical Mounting $8.05 Automatic Air Vent #67 1/8" MIP, 50 PSI, 3 3/4" x 9/16", Vertical Mounting $7.20 Automatic Air Vent #67AS - Auto Shut-Off 1/8" MIP, 50 PSI, 3 3/4" x 9/16", Vertical Mounting, Auto Shut-Off $10.60 Automatic Air Vent #68 1/4" MIP, 50 PSI, 4" x 1 9/16", Vertical Mounting $10.30 Automatic Air Vent #72 1/8" MIP, 75 PSI, 1 1/4" x 1/2", Vertical or Horizontal Mounting $2.85 Pushbutton Manual Vent #95 1/8" MIP, 50 PSI, 1 5/8" x 9/16", Vertical or Horizontal Mounting $2.85