Maid O Mist 75 psi Auto-Vent Automatic Air Valve

The model No. 72 Auto-Vent is a fast venting valve of the expansion type, up to 75 lb. pressure. For vertical or horizontal mounting on convectors, baseboard, and freestanding radiators. 1/8″ I.P. Male connection, 1-1/4″ x 1/2″. All expansion and contraction of the single nonporous, composition disk is confined to 4 vent ports. Manual venting and tight shutoff are controlled by a valve cap with screwdriver slot adjustment.