I dont know what brand name they are specifically. The manufacturer had their name on a giant sticker on the tanks. I strip all these sorts of stickers off steel tanks upon purchase and these are no different. They both work perfectly. Both tanks are DIN valve. One of the tanks has a brand new valve installed. If you buy them before this weekend, they come filled with Nitrox (36 in one, 40 in the other) I have upgraded to 130's and now own two too many tanks! Hoping to sell quickly at that price! Im pretty sure you are going to be on my boat this weekend Dustin, (assuming you are the same Dustin!) so if you would like to see/demo the tanks, then let me know.