Parts of Scuba – Breathing tubes, Check valves, Mask and Mouthpiece

Breathing Tubes

The breathing tubes currently used in scuba consist of nonkinking, corrugated, or bellows-type rubber or neoprene hose. There are usually an inhalation tube and an exhalation tube. The inhalation tube carries air from the demand regulator to the mouthpiece or mask, and the exhalation tube carries the expired gas to the exhaust valve where it is discharged into the water.

Check Valves

Your scuba may use 3 types of check valves: inhalation, exhalation, and exhaust. The breathing check valves may be incorporated into the full face mask or the mouthpiece, and a check valve is always a part of the exhaust-valve assembly.
The inhalation check valve prevents exhaled air from

After a course of lectures and practice, the instructor and pupil dive in a check-out swim.

entering the inhalation tube. Even more important, it prevents water from entering the demand regulator when the mask or mouthpiece floods.

The exhalation check valve prevents water in the exhalation tube from flooding the mouthpiece. Neither of these valves is essential for scuba use, and either or both may be missing from your outfit. However, they do greatly simplify the problem of clearing water from the system.

The important exhaust check valve prevents water from entering the system. All open-circuit scuba must have at least one check valve-the exhaust valve.

The Mask and Mouthpiece

Your scuba may include a full face mask, a mouthpiece, or a combination of the two to provide you with air. A full face mask usually has the demand regulator mounted directly on the mask. Mouthpieces and mouthpiece-mask combinations are commonly used with breathing tubes and cylinder-mounted demand regulators.

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