Available in PVC for sizes from ¼ - 3/8 and PVC or CPVC in sizes from ½ - 6, the True Union "Z-Ball" valves feature a visibly identifiable black handle that makes them easy to spot and special labeling that identifies their use for Sodium Hypochlorite applications in a plant environment. The valve's specially drilled "Z-Ball" design keeps inner valve surfaces constantly vented to eliminate gas accumulation, and wetted to prevent crystallization of salts which can freeze the valve and make it inoperable.