Maid-O'-Mist 75 Automatic Air Vent 1/2" x 3/4" NPT 150 PSI Brass

The Maid-O'-Mist Model 75 is a professional-grade automatic air eliminating valve designed for hydronic heating and cooling systems. This float-operated vent automatically releases trapped air from concealed radiators, pipe lines, tanks, and other liquid-filled devices, improving system efficiency and preventing circulation problems caused by air pockets.

Key Features:

• Brass construction with self-closing, float-operated valve mechanism
• 1/2" female NPT x 3/4" male NPT threaded connections
• 150 PSI maximum working pressure rating
• Monel metal spring and Neoprene valve seat unaffected by high temperatures, oil, and anti-freeze
• Vertical mounting orientation for optimal performance
• Patented cap design allows manual venting and leak checking
• No air chamber required for operation
• Bright brass finish for corrosion resistance

Part of the trusted Maid-O'-Mist No. 7 Series Auto-Vents, this valve is ideal for boiler systems, radiant heating panels, solar heating applications, convectors, baseboard radiation, and water-based HVAC systems. The compact 4-3/4" x 2-1/4" footprint allows installation in tight spaces previously difficult to vent properly.