Hoffman 791 Water Vent Valve.
• For convectors and small mains
• Safety drain connection for discharging moisture
• Fitting and ferrule for 3/16" (4.8mm) OD tubing
• Telescopic siphon tube
• 1/4" NPT straight shank
• Maximum operating pressure 50 psig (3.5 bar)°
• Maximum pressure 50 psig (3.5 bar)