Xylem 401437 Model 75H Steam Main Air Vent Valve 1/2" x 3/4"

The Xylem-Hoffman Specialty 401437 Model 75H is a float-type thermostatic air vent designed for medium and large steam heating systems. This non-vacuum steam main vent automatically releases air and non-condensable gases from steam lines, preventing water hammer and improving system efficiency.

Key Features:

• Float-type thermostatic operation for reliable air venting
• 1/2" NPT female x 3/4" NPT male straight shank connections
• Maximum operating pressure: 10 psig (0.7 bar)
• Maximum system pressure: 15 psig (1.0 bar)
• Single non-adjustable port design
• Non-vacuum application
• Maximum temperature: 240°F

This steam vent maintains proper system pressure and enhances energy efficiency by automatically releasing trapped air during system startup and operation. The Model 75H features a higher operating pressure rating (10 psi) compared to the standard Model 75 (3 psi), making it suitable for systems requiring greater venting capacity under pressure. Manufactured by Hoffman Specialty, a trusted Xylem brand with over 100 years of experience in steam heating solutions.