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The Aqua-Pure AP430, AP430SS Hot Water Filter System comes with the AP431 Filter Cartridge and the 3/4" Inlet and Outlet water pipe connector. The Aquapure AP430 hot water filter system installs directly on the 3/4" pipe leading into your hot water heater. The AP431 will extend the life of your hot water heaters or tankless hot water sytems by stopping scale build-up and corrosion. The AP430 Hot Water System Protector not only increases the effeciency of your hot water sytems so they run cleaner, but it also saves you money on maintenance costs.