... compressed air. As a device to compress gas, impressure gas pressure and conveying gas, it compresses free state air into compressed ... alarm system.The final stage high-pressure safety valve is steplessly, 100% safe.Oil/water separator after each level, each level has ... use 12 months. 15-30Mpa Scuba Diving Air Compressor for Diving Operations,Salvage,Fishing,Aquaculture,Sediments Salvage Underwater