WHO'S USING YOUR WATER? The FSS 550 Guard'N'Lock 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 550 Guard'N'Lock is made of non-corrosive material and includes two keys (additional replacement keys are available). The FSS 550 Guard'N'Lock 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 550 Guard'N'Lock installs on the handle of the hose bibb with minimal assembly. This is perfect for homeowners who would like the added convenience of leaving their hose attached, yet still maintaining the highest level of protection from water theft. Includes 2 keys.