💧 Seal the Deal on Clean Water! Crafted for durability, this O-ring maintains a reliable seal for your whole house system. Use genuine A.O. Smith filters to promote sustainability and effective contaminant removal. Designed for hassle-free replacement, keeping your water system running smoothly. Ensure a perfect fit with a 5.48-inch diameter for optimal performance. Change every 3-6 months to ensure peak performance and peace of mind. Water-tight Seal 5.48" Diameter Genuine Replacement The AO Smith AO-WH-LG-OR is a high-quality O-ring designed for whole house water filtration systems. With a diameter of 5.48 inches, it fits most filter sumps made for 4.5-inch filter elements, ensuring a secure, water-tight seal. This genuine replacement part is essential for maintaining optimal contaminant removal and system performance, making it a must-have for regular maintenance every 3-6 months.