A CPAP hose is the tubing that delivers air from the flow generator to the CPAP Mask. The hose is commonly called the main hose, or tube. The tube is flexible and has silicon cuff like ends. The standard length for a CPAP hose is 6 ft, though this type hose are available in lengths from 18 inches to 10 ft. CPAP hoses are often used to connect a heated humidifier into the breathing circuit. The maximum length of hose that can be used, without changing the flow generators pressure to accommodate the extra length, is 10 ft.
See: https://www.cpap.com/find-cpap-products/HOSE