The Whisker Litter-Robot 3 Seal Strip is designed to effectively trap unpleasant odors, ensuring the waste drawer remains fresh. It features brush-type seal strips that are strategically positioned on the base beneath the globe. This product is compatible with any Litter-Robot 3 model, providing a seamless fit and optimal performance. Replacement is recommended when the strips become worn or begin to peel. Note: Not compatible with Litter-Robot 4.