In the past you had to either invest in a large nitrogen gas bottle, regulator, and a fill kit or you had to find and then haul your rig to a shop that would charge the shocks for you.

Dry Ice, Liquid Nitrogen, Compressed Gases, Gas Tank regulators and valves are available through Procurement and Payment Services' Lab Gas Program: View a list of all available products, quantities ...

In preparation, Mr Ridgeway attached a hose to a regulator and a cylinder of gas. He drilled holes under her bed and hid the deadly device that would kill his wife, Pepita Ridgeway, in her sleep.