The purpose of the pin-indexing system for compressed gas cylinders is to ensure that the correct regulator is used for the cylinder. Thus, Option A is the correct statement.
The pin index system refers to a safety system designed to make sure the suitable gas is filled into the suitable cylinder, and that the cylinder will most effectively connect with the correct equipment. The positions of the holes at the cylinder valve correspond with the pins suited for the yoke connected to the equipment.
Therefore, The purpose of the pin-indexing system for compressed gas cylinders is to ensure that the correct regulator is used for the cylinder. Thus, Option A is the correct statement.
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