A-clamp
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An A-clamp or yoke is a type of clamp very often used to make a pressure-tight high-pressure fastening in scuba gear. It occurs in diving regulators, cylinder manifolds, cylinder filling hoses, and other devices that need to be connected to the usual type of breathing apparatus cylinder that has a pillar valve. It is so called because it is somewhat like the letter uppercase A.
An A-clamp cannot contain the pressure used in some modern very high-pressure scuba cylinders: those use a screw connection instead.