Matco-Norca introduces heating steam air valves in various patterns and sizes. For use with hydronic radiators and steam boiler systems, HAV steam valves control the release of steam in radiators and properly balance the system so that individual radiators produce heat appropriate for the space being heated. Constructed of brass with chrome-plating, the valves come in angle, straight and adjustable options and various sizes: 1/8” (angle, straight and adjustable), 1/4” straight, and 3/4” x 1/2” straight.