you take the tank to a place that has an air pump like a gas station. there is a valve stem on the brass fitting on the tank that you use to put the air supply to and fill the tank.. since this is a high PSI tank it is unlikely that you will overfill the tank but in any case always watch the gauge on the tank to insure that you don't overfill it
no, it is crimped onto the hose.
I fill it with a compressor.
a corrugated Material
No regulator on the system, just a tank pressure gage.