Each compressor comes assembled on an internally and externally coated air tank and includes a self-purging regenerative dryer with aftercooler. The version with the sound enclosure has a sound level of less than 60 dB. Models in 115 V - 60 Hz and 230 V - 60 Hz are equipped with ASME? rated pressure tanks. Line Pressure Regulator with gauge and Line Ball Valve are standard on these units.