21 gallon 175 PSI Oil-Free Vertical Air CompressorThis 175 PSI vertical air compressor delivers plenty of air yet has an oil free pump for less maintenance. The powerful 1. 5 running HP universal motor with thermal overload protection is up to 25% quieter than other compressors in its class. The wrap around handle and console cover protect the pump, motor and gauges. A forward facing drain valve provides fast, thorough tank draining. Up to 143% more runtime Up to 25% quieter 5% more tank size Oil