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We are happy to present the excellent Hoffman Model 4A Part No. 401413, 1/2" x 3/4" Straight Steam Main Air Valve.
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Hoffman Design 4A Component No. 401413, 1/2" x three/4" Straight Steam Main Air Valve (non-vacuum)
- For household or tiny 1-pipe or two-pipe methods
- Set up six-ten" (one hundred fifty-250mm) over horizontal return and eighteen" (450mm) over the boiler drinking water line
- Highest functioning force 2 psig (.13 bar)(Fall absent force - highest force towards which the vent can open up).
- Highest force ten psig (.seven bar)
Float-type thermostatic vent
Single non-adjustable port
1/2" NPT female and 3/4" NPT male straight shank