Xylem 401434 Hoffman Model 75 Main Steam Vent 1/2" x 3/4" NPT

The Xylem 401434 Hoffman Model 75 is a float-type thermostatic main steam vent designed for medium to large steam heating systems. This professional-grade air valve automatically releases trapped air from steam mains while preventing steam loss, ensuring efficient system operation and faster heat distribution.

Key Features:

• Float-type thermostatic design for reliable automatic operation
• Single non-adjustable port optimized for main steam lines
• 1/2" NPT female and 3/4" NPT male straight shank connections
• Maximum operating pressure: 3 PSI (0.2 bar)
• Maximum pressure rating: 15 PSI (1.0 bar)
• Temperature range: 140°F to 240°F
• Non-vacuum design for low-pressure applications
• Durable steel body construction

The Hoffman 75 closes at a higher temperature than standard radiator vents, allowing it to vent more air from steam mains before closing. This results in faster steam circulation and improved system efficiency. Ideal for commercial and residential steam heating systems, boiler installations, and HVAC applications requiring reliable air elimination from condensate return lines.