ISO 9001:2008 manufactured HAV Steam Air Valves from Matco-Norca are available in various patterns and sizes. For use with hydronic radiators and steam boiler systems, heating air vents 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, they come in angle, straight and adjustable options and various sizes – 1/8-inch (angle, straight and adjustable), 1/4-inch straight, and 3/4- by 1/2-inch straight. They have a maximum operating pressure range from 1 1/2 up to 6 psi. 800/431-2082; www.matco-norca.com.