Tufline 1/4-turn high performance butterfly valves feature an axially pliant seal that extends service life. Bi-directional flow and shutoff are easily accommodated. Valves' seal includes two components: an outer segment of chemically inert, glass reinforced PTFE, and a deformation-resistant, memory-core membrane. Valves are capable of handling virtually any material and are available in sizes to 72 inches. Xomox Corp. 4444 Cooper Rd. Cincinnati, OH, 45242