WHO'S USING YOUR WATER AFTER HOURS? The FSS 500 by Flow Security Systems, Inc. has a unique patented free-spinning design in order to secure faucets and hose bibbs from miscellaneous vandalism, unauthorized use, tampering and water theft. The FSS 500 is a revolutionary new way to secure your hose bibbs, silcocks, and outdoor faucets. Comes with two revolutionary keys that will not rust or corrode(additional replacement keys are available). Unlike other security devices The FSS 500 can be keyed alike so that multiple hose bibbs can be secured with the convenience of having only one key. Along with providing complete security and peace of mind at your house, vacation home, or apartment, The FSS 500 is perfect for commercial and industrial buildings, is ideal for schools,college campuses and shopping centers and can easily secure hospitals and apartment buildings hose bibbs in seconds. Includes 2 keys.