John Guest, of Pine Brook, N.J., announces its new 1/2?? shut-off valves. These valves feature the same simplicity as their fittings for providing a fast and secure method of connecting plastic and soft metal tubing. Specifically designed for use with potable liquids, compressed air, CO2 lines in beverage dispensing and pneumatic applications, the valves afford the most reliable and cost-effective solution to tubing connections. The line of PISV valves is also available in 3/8?? O.D. size with long or short handles.