Model 4A - Part No. 401413
Air Valve (non-vacuum)
• Float-type thermostatic vent
• For residential or small one-pipe or two-pipe systems
• Single non-adjustable port
• 1⁄2" NPT female and 3⁄4" NPT male straight shank
• Install 6-10" (150-250mm) above horizontal return and
18" (450mm) above the boiler water line
• Maximum operating pressure 2 psig (0.13 bar)*
• Maximum pressure 10 psig (0.7 bar)
*Drop away pressure (maximum pressure against which the vent can open).
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