Honeywell Braukmann No. 4V Coin Operated Air Vent. It projects only slightly lying almost flush with the radiator. 150 P.S.I.G. Working Pressure - 250F Maximum Operating Temperature. Features of Honeywell 113055 Braukmann No. 4V Coin Operated Air Vent Specially designed for the new types of radiators Projects only slightly Working Pressure - 250F Maximum Operating Temperature Precision construction Package Contents: Honeywell 113055 Braukmann No. 4V Coin Operated Air Vent Honeywell 113055: Braukmann No. 4V Coin Operated Air Vent