This large-diameter (4.5-inch) filter housing is designed to accommodate big filter cartridges, providing a versatile and powerful solution for point-of-entry (POE) water filtration in homes, offices, restaurants, and commercial facilities. With a Whole House Filtration System, you can remove sediments, chlorine, heavy metals, and other impurities at the main water supply, ensuring that every tap in your property delivers clean, safe, and great-tasting water.