Does that just imply that the lubricant used in their compressors isn't approved for use with O2? Perhaps they have a block that uses a lubricant that is safer to use with higher O2 levels. There are no doubt people out there that use non nitrox compressors to pump high O2% without an issue and against the recommendations of the manufacturer. It's one of those things that it's only an issue the one time it becomes an issue. There are people out there who have claimed to PP fill without O2 cleaning and have never had an issue. I can't verify that claim nor can I say that it makes me second guess getting my tanks O2 cleaned every year at Viz. I am curious as to the outcome as I have been looking at purchasing a booster pump so I can PP fill and blend myself and just pay to top off with air. Isn't there a Bauer rep that frequents the board?