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Question:

At the back of trailer used to tow other trailers are shut-off valves, also called _________.

A Cut-out cocks.
explanation

Shut-off valves (also called "cut-out cocks") are used in the service and supply air lines at the back of trailers used to tow other trailers. These valves permit closing the air lines off when another trailer is not being towed. You must check that all shut-off valves are in the open position except the ones at the back of the last trailer, which must be closed.

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