When using the Masterguard on your BEC 75 Automatic chicken drinker it prevents water dilution, which in turn allows any added medication, vitamins and sanitates to maintain their full strength. Tests have proven that without the Masterguard fitted, the sunlight can encourage bacteria to grow and cause 25% evaporation of valuable additives that have been added to the water. The Biomaster is fitted to you existing Bec 75 and can be fitted as is, or with a extension to hold the guard up higher. The guard fits losely and should act to stop birds alighting on the drinker and dissuade birds coming in for a drink. The guard will also mean this BEC75 drinker could work as a pigeon drinker as well.