Rain Harvesting TMTG02 Tank Guardian Easy Clean 16 in. Protects tank screens from the build up of leaves and debris - 1mm stainless steel filter screen Easy to use - just lift the Tank Guardian off of the 16" tank collection screen by the easy grip handle and remove debris Easy to install - no tools required, simply place on top of the existing tank screen Must be placed on top of a 16" Collection Screen (refer to Product description below) CANNOT be used without this item Keeping the tank screen clean helps to - reduce rainwater contamination caused by debris decomposing