Used in steam heating applications to vent air in one-pipe steam systemsFor use with steam radiators onlyMaximum pressure: 10PSIBrass body and floatProvides venting1/4". Maximum pressure: 10PSI. Non-vacuum. Non-adjustable. Float type. Used in steam heating applications to vent air in one-pipe steam systems. Brass body and float. Provides venting. For use with steam radiators only.