Available in stainless-steel, carbon-steel and brass body materials, the 60 Series ball valves prevent leaks to the atmosphere with a live-loaded stem seal. Spring-loaded valve seats exert constant pressure against the ball to provide a reliable seal, even in low-pressure conditions. They have a two-piece chevron, live-loaded packing which helps to prevent leakage and are available with a number of end connections and performance options. Swagelok, 31400 Aurora Rd., Solon, OH 44139-2764. Tel. (440) 349-5934; www. swagelok.com