Electric high pressure compressor Coltri Sub MCH-6 ET. The model is equipped with a three-phase electric motor. It is a portable forced air-cooled compressor with four pressure stages. The Coltri Sub MCH-6 ET diving compressor is designed to fill single cylinders up to 20 liters. After each cylinder, a technical break is required for 15-30 minutes, depending on the ambient temperature. It is not designed to fill any type of cascading storage system, nor is it intended to. Reference: SC000130