Water filters provide cleaner, great-tasting water for drinking fountains, water coolers, and bottle fillers. All of Elkay's filters are made with activated carbon to improve taste and odor. Many also reduce contaminants such as lead. Elkay?s filters are easy to connect and are self-contained replaceable cartridges, limiting exposure to contaminated media. Elkay 51300C Features: Multi-pack replacement filters for models with WaterSentry Plus filtration system (Bottle Fillers) The filter should be replaced every 3,000 gallons or 1 year after installation Equipped with Quick-Disconnect, 1/4 turn installation, as well as automatic inlet shut-off valve that closes when the filter is removed Designed to reduce lead, particles, and chlorine Also reduces odors and discoloration from incoming water Upgrade the water filtration system of your Elkay brand faucet with the Elkay 51300C_12PK WaterSentry Plus Replacement Filter Cartridge. This filter cartridge is compatible with certain Elkay WaterSentry Plus models and ensures clean drinking water free from impurities. It is made in the United States and has a OLD MODEL ( 3.25"D x 3.25"W x 12.5"H ) This replacement filter cartridge is part of the WaterSentry Plus collection and is a suitable accessory for maintaining your Elkay water filtration system. It is designed for use with Elkay brand faucets, providing an easy and efficient way to ensure clean and safe drinking water.