Air hose gun/duster Volvo fh

Has anyone installed a air gun in their truck. I don’t know if I’m to cut the hose on the back of the seat and connect from there. A few pics below. Thanks

I used to have a 55 plate fh12
That had a single solid black plastic air feed at the rear of the seat just like yours.
I cut it in the middle with wire cutters so it was neat then used a coupling T piece the same as you’ve got.

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Likewise

As above.