Taco 409-3 Commercially Rated Brass Air Vent 3/4" NPT 150 PSI

The Taco 409-3 is a heavy-duty brass air vent rated to 150 PSI system operating pressure, designed specifically for commercial and residential hydronic heating systems. This automatic air vent removes trapped air from radiators, piping, and heating loops to help prevent noisy systems, corrosion, and uneven heating.

Key Features:

• Conical shape significantly increases clearance between water level and internal mechanisms, reducing the potential that dirt floating on top of the water could foul the venting operation
• Convenient outlet connection for 3/4" ID flex tube waste connection
• High-capacity design ideal for placement throughout commercial systems
• Temperature range: 35 to 240°F
• 3/4" NPT threaded connection for easy installation
• Durable brass construction ensures long service life and corrosion resistance

The Taco 409 is intended for installations filled with 100% water or approved glycol solutions (do not exceed 50% glycol) for hydronic heating systems. Its robust construction and high-capacity float design make it suitable for demanding commercial applications while remaining an excellent choice for residential installations requiring reliable automatic air elimination.