Xylem 75 3/4" x 1/2" Main Line Steam Vent 3 PSI

The Xylem 75 Main Line Steam Vent is a reliable, high-capacity air eliminator designed for use on main steam supply lines in one-pipe and two-pipe steam heating systems. With a 3/4" inlet x 1/2" outlet connection and a rated operating pressure of 3 PSI, this vent efficiently releases trapped air from the main line to allow steam to travel quickly and evenly throughout the system.

By venting air ahead of the steam, the Xylem 75 helps reduce warm-up times, improve system efficiency, and promote even heat distribution across all radiators. It is well-suited for larger residential and light commercial boiler systems where a robust main vent is critical to proper steam flow.

Key Features:

• Connection Size: 3/4" inlet x 1/2" outlet
• Maximum Operating Pressure: 3 PSI
• OEM / Cross-Reference Number: 401434
• Designed for main steam line venting on gravity and pumped steam systems
• Thermostatic operation — opens to release air, closes automatically when steam arrives
• Durable brass and stainless steel construction for long service life
• Compatible with one-pipe and two-pipe steam heating applications

The Xylem 75 is a trusted replacement or upgrade main steam vent, engineered to keep low-pressure steam systems running at peak performance. Also referenced by OEM part number 401434.