ok, now let's take a moment to talk about shop safety... i am posting this here instead of the shop forum because most of the shop folks probably know better and what i did could happen on any homestead. my air compressor needed a new drain valve. i knew there was rust plugging up the works and the old valve had siezed. when i removed the old valve, after having checked the gauge for pressure and seeing it read zero or near to zero, i got a very small burst of air and then nothing. i pressumed the tank to now be empty of air. i looked in and saw some rust around the hole and grabbed a bit of wire to run around the interior lip of the hole to loosen any rust. i would then power on and blast the rust away. when i inserted the wire, a powerful blast of air pressure blasted rust into my hand. my hand was peppered with red dots and a small piece of rust logged in one spot of my thumb. i never expected there to be so much pressure left in the tank. thankfully i had my head to the side and my eyes were not blasted. not expecting a blast, i could easily have had my face right in there. i was a bit careless i guess, but in my defense, the pressure release only clears the tank to 20 lbs. of pressure and the drain hole was blocked. i also witnessed a small amount of air escape and then nothing so i thought the tank was empty. next time i will... wear saftey glasses use an open air hose or device to remove all of the pressure double check the gauge...tap the gauge...not trust the gauge possibly wear gloves continue to keep my face clear (instinct protected me on this one as i did not consciously have my face clear...force of habit i guess) expect the unexpected let's be careful out there!