Ceramic cartridge, the core component of a faucet, combines hot and cold water and regulates water flow. Similar in function to an engine within a car, it must operate smoothly and consistently. To select the correct ceramic cartridge, measure the outer cylinder diameter of the existing valve cartridge. It is advisable to purchase two units to verify quality and ensure compatibility with your faucet. Before installation, confirm that the ceramic cartridge is compatible with your faucet model. Ensure the locating pin is properly inserted into the designated hole, and securely tighten the copper cover. Water-saving benefits: A high-quality ceramic cartridge helps prevent leaks and reduces water waste. Note: Measurements are taken manually; allow a tolerance of 13 cm. Due to variations in lighting and display screens, colors may vary slightly. Actual product may differ slightly from images shown.