With this setup, you are able to maintain a smaller nitrogen bottle for the airjacks and tires while keeping a larger bottle remote.

When the small bottle is low on nitrogen, simply hook the two up and allow the gas to transfer from the large bottle to the small bottle.  This gives you the convenience of the small bottle with the capacity of the large bottle.

We keep a large bottle at the track in our pit box, but wheel out a smaller bottle for the day to day activities.

Demon Speed motorsports Porsche GT3 Cup Car Racing Essentials – YouTube