Since 1979 Hydra-Shield Manufacturing, Inc. has been a leader in the Hydrant Security Industry, designing and manufacturing the highest quality fire hydrant locks, devices, accessories and valves. Unauthorized water usage puts an expensive burden on services, budgets and taxpayers. The need for proven hydrant security is why so many communities choose Hydra-Shield products. Many major municipal water departments like New York, Chicago, Washington DC, Boston, Atlanta, Detroit and Newark rely on Hydra-Shield products, such as the Custodian®, Dome Lock, V-lock and our other products as a main source for Fire Hydrant locks and security.