Xylem 508 Water/Steam Vent Valve 1/8" NPT 50 PSI Radiator Air Vent

The Xylem-Hoffman Specialty Model 508 is a professional-grade water and steam vent valve designed for automatic or manual venting of radiators, convectors, and hydronic heating systems. This disc-type vent features a 1/8" NPT male straight shank connection and is rated for a maximum operating pressure of 50 PSI.

Key Features:

• Built-in check valve prevents backflow and system contamination
• Disc-type venting mechanism for reliable air release
• Suitable for both automatic and manual venting applications
• 1/8" NPT male threaded connection for easy installation
• 50 PSI maximum pressure rating for residential and light commercial use
• Can be installed vertically or horizontally for installation flexibility
• Constructed with brass components for durability and corrosion resistance

This model replaces the obsolete Hoffman Model 500 (part number 401473) and serves as a direct replacement for Bell & Gossett 17-JR and 17-SR air vents. The Model 508 is ideal for eliminating trapped air in hot water heating systems, steam radiators, and convector units, ensuring efficient heat transfer and quiet operation.