✅ SOLVED What is the purpose of this tubular lock?

[vscience]

What is the purpose of this lock? Never seen one before. Put key in the end to torque it closed. https://flic.kr/s/aHBqjAcX9P

 

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[50bmg]

trailer hitch pin

 

[50bmg]

5/8 in. Trailer Coupler Pin Lock with 2 Keys

Amazing deals on this 5/8In Trailer Coupler Pin Lock With 2 Keys at Harbor Freight. Quality tools & low prices.

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[hollARDog]

Or any other pipe-to-pipe lock.