Xylem 401497 Model 77 Water Vent Valve 1/8" NPT 50 PSI

The Xylem Hoffman Specialty Model 77 Water Vent Valve is designed for efficient releasing of air in hydronic heating systems, such as baseboard radiators, convector radiators, and small heating units. This compact air vent features a durable construction and reliable performance for residential and light commercial applications.

Key Features:

• 1/8" NPT straight shank connection for easy installation
• Maximum operating pressure of 50 psig (3.5 bar)
• Maximum temperature rating of 240°F (116°C)
• Built-in check valve prevents air from re-entering the system when pressure drops
• Brass and stainless steel construction ensures long life in glycol environments
• Top-mounted replaceable seat for easy maintenance

The Model 77 is part of Xylem's Hoffman Specialty line of water vents, trusted by HVAC professionals for decades. Its automatic air release mechanism helps maintain system efficiency by eliminating air pockets that can reduce heat transfer and cause circulation issues in hydronic heating systems.