500cc cylinder with a head and a clock

500cc cylinder with a head and a gauge to know the air amount in the tank, withstands pressure of 450bar, filled ready 330 bar, lightweight, you can fill it from the rifle retractor tank or the firework 100 twice or the check tank once, and it has multiple uses and saves you from the compressor, you can add a valve for filling car tires, the tire is empty, it takes 35psi which is only 2.5 bar, and the cylinder has 330bar, meaning unlimited filling, easy to carry, and you can store it anywhere.