Hoffman
Hoffman Air Valve 401413 4A, 1/2" x 3/4" Straight Steam Main Air Valve
Quantity:
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)(Drop away pressure - maximum pressure against which the vent can open).
Maximum pressure 10 psig (0.7 bar)