Powerex Class Zero oil-free reciprocating and scroll air compressors offer the highest level of air purity classification according to the ISO 8573-1 standard providing exceptional air quality, reliability, and efficiency, making them the ideal choice for maintaining the highest standards of purity and safety in drinking water production and distribution. By eliminating the possibility of oil carryover, our compressors help protect public health and safety by ensuring the purity of the drinking water supply.