We use nitrogen to drive medical air tools because the gas is so dry it prevents the tools from oxidizing — and makes them last 3-4 times longer. The most technical version of N₂ pressure driving occurs in the operating room. On Site Gas has developed an entire line of specialty nitrogen generators that produce surgical, tool-driving medical grade USP 99% nitrogen at up to 180 PSIG using only oil-free compressors. Our nitrogen generation systems have been operating in hospitals for several years — saving money and eliminating the danger of changing high-pressure N₂ cylinders.