Chicago Faucets compression cartridges can easily be interchanged with ceramic style cartridges in almost any valve. Chicago Faucets compression stems use a rubber washer to open and close the flow of water. Time tested for over 100 years, Chicago Faucets compression style stems will last with minimal maintenance and easy washer replacement. Note: You must always use a genuine Chicago Faucets cartridge or washer when repairing any Chicago Faucet.