The Noritz SS-HBC-1 has been discontinued from the Noritz line
Order Replacement Cartridge
However, if you already own an HBC-1 and would like to still order replacement cartridges you can still do so from our partner manufacturer. Please be ready to give them the Noritz HBC-1 model number and they can assist you.
The compatible cartridge will be the SS-XL (Large Scale Stick)