Nitrox..... Ins and outs,, certs,gear,tanks but on tanks once nitrox is added can it be used for plain ol air? cause i have 2 tanks, my g/f will be getting cert. this year and we will be sharing my tanks and equip. also i have 2 sherwood bruts are those nitrox useable and if so, can u use plain ol air in em? funny this formum started i was gonna contact you bout this clay lastnight.