snorkel
curved tube with a mouthpiece for breathing air tube that extends above the surface of the water adjustable nose clip or mouthpiece non-return valve at the end of the tube purge valve for clearing water from the tube flexible or rigid tubing skirt or mask to keep out water and debris
snorkel which has curved tube with a mouthpiece for breathing snorkel which is air tube that extends above the surface of the water snorkel which is adjustable nose clip or mouthpiece snorkel which has non-return valve at the end of the tube snorkel which has purge valve for clearing water from the tube snorkel which has flexible or rigid tubing snorkel which has skirt or mask to keep out water and debris