is it 2 lines with a coupling so that the lines can run thru gromets at both ends?

my guess is the factory manually flared the ends of each line at this location.

guess a gromet could be sliced to fit over line - duh.

i measured the length from front to back at about 4'8" +-

The rear end of the line has crappy curves so it is not
possible to get the line in the tunnel in one piece