This unique Shut-Off Valve provides quick, positive on/off control of flow through flexible plastic tubing (see our catalog for more tubing). Its single-piece design assures maximum laminar flow through even the smallest tube sizes, and the valve itself is small enough for use in very compact spaces. When the valve is in the closed position, an orange band is clearly visible, to prevent operator error. Shut-Off Valves can be used for either pressure or vacuum applications.