1. If you have a problematic plumbing fitting, you may only need to the cartridge and not the entire fitting. 2. Our Kerox NKJ35A replacement cartridge can the non working cartridge of a single lever faucet. It has a diameter of 35 mm with conventional volume and temperature control, but with the temperature range shifted to the right (NKJ). 3. The NKJ35A single handle faucet rotates differently than the normal K35A cartridge. The NK 35 model has either NKJ (right rotation of the temperature range) or NKB (left rotation of the temperature range) volume and temperature control. 4. However, both options are ideal for a side faucet to prevent the lever from hitting the splash. This cartridge is made of ceramic, the latest development in modern technology of fittings.