The picture shows a Hong Yeng high pressure compressor (4500 PSI) and associated plumbing to charge the red scuba tank or any of my PCP air rifles. The white bucket contains a coolant made of distilled water, antifreeze and a wetting agent for maximum cooling. The canister with the blue beads is the pre drier that dries intake air going to the compressor and the smaller black and gold steel containers are HP water and oil separators.