This is a great air vent! We think Taco has made the best Air Elimination Vent for the money with the 4003 Hy-Vent. Size 1/8" MIP, 150 PSI Max. A Top TACO Value! TACO Hi Vent, High vent,

Automatically vent accumulated air from closed loop hydronic heating systems. 1-1/2" in.Dia. x 3- 3/16" in height, connects to pipe with 1/8 in. Male NPT.

Boiler Water Air Scoop - Size 1 inch, for air elimination in a water boiler / hydronic heating system. Piping connections are 1 inch FIP, the cast iron air scoop also includes standard tapings for fitting an expansion tank and automatic air vent.

Air Scoop - Size 1-1/4 inch, used for air separation and air elimination in a water boiler / hydronic heating system. Piping connections are 1 inch FIP, the cast iron air scoop also includes standard tapings for fitting an expansion tank and automatic air vent.

Legend Valves - Heating Specialties - Coin Key Air Vent

Taco’s family of air elimination products delivers the most complete and effective means of air removal on the market. The enhanced level of the VorTech® Air Separator eliminates the damaging effects and irritating noise caused by unwanted system air. Available in 3⁄4” – 2” sizes, they require no minimum run of pipe and have a convenient 1⁄2” tapping for easy installation of an expansion tank.

#79 Main Vent For Hydronic Heating, #75 Max operating Pressure, connection size; 1/2" F.I.P. or 3/4' M.I.P. Measures: 6-5/8" long x 2-1/2" diameter