Repair your leaky faucet with the DANCO Ceramic Cartridge for Kohler Faucets. Replacing a faucet cartridge is an economical, cost saving alternative to replacing the entire faucet. A dripping faucet wastes both water and money. The installation of a new faucet cartridge will stop the drip and return your faucet to like new condition. This faucet cartridge is designed to fit Kohler OEM # GP500520 and is compatible with Kohler shower valves K-304 and K11748 tub/shower faucets.