DISCONTINUED BY MANUFACTURER......North Ball valve lockout devices are designed to prevent inadvertent, accidental or unintentional activation of a quarter turn type ball valve. North Ball valve lockouts fit most major brands of ball valves. They are easy to use and do not require special padlocks to apply. Made from polypropylene plastic. Ball valve lockouts will help you comply with OSHA regulations. Ball Valve Lockouts available in three sizes.