■ Sea One water supply hose will deteriorate when used for a long time. Replace if cracks or stains become noticeable. ■ The replacement method is simple. Remove the hose from the "faucet switching cock" and "base of the main unit" and replace it with a new hose. If you are long wearing it, please cut it off. ■ Water supply hose for Japan Gaishi C1 (Sea One) CW-101 and CW-201. Will not work with other model numbers or other manufacturers.