It is a design of vertical compressor which can be used under a narrow but high workbench. It consists of an old 8kg powder fire extinguisher and two fridge aggregates. The compressot should be also equipped with a pressure switch and safety valve.
The compressor maintains 8 bars and is quite well sealed. All the threads were sealed with Teflon tape and oakum.
There is a small valve under the tank. It is used for drying the water which melts in the tank.