Air seat

Righty o, had a quick search on here and google but can’t seem to find an answer.

I’ve just installed a TGM air seat into an old L2000, and I have a white and black pipe to connect. I’m guessing 1 is inlet and 1 is outlet but no idea which is which.

Also, the best/closest place to connect it up would be great. I’ve got a pto airline in the dash that I could use but that’s 4mm and it means extra connectors but might just be the easiest.