Answer :
Final answer:
The coupling devices used to connect the service and emergency air lines from the truck or tractor to the trailer are called glad hands. Glad hands provide a quick and efficient method for connecting and disconnecting the airlines.
Explanation:
The coupling devices used to connect the service and emergency air lines from the truck or tractor to the trailer are called glad hands. Glad hands are fittings attached to the ends of the airlines that provide a quick and efficient method for connecting and disconnecting the airlines. Glad hands consist of two halves: one half is located on the truck or tractor and the other half is located on the trailer. When the two halves are brought together, they form an airtight connection that allows air to flow between the truck or tractor and the trailer.
This type of coupling device is commonly used in the transportation industry to ensure a reliable and secure connection for the airlines.
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