I will tell y'all that you should not risk filling up an expired tank. I made that mistake once. I was enjoying a great couple days at my old camp in La. It was a pretty tense moment when I woke to a squeeking sound to find ice had formed all over the tank. It had a crack in it. With visions of JAWS dancing in my head, I very CAREFULLY lifted it up and brought it out to the dock. The tide was going out, so I put it so that it was almost teetering on the edge of the dock, and I grabbed some 2X4 scraps. I threw the scraps at it from around the corner of the camp and knocked it into the water. I kept waiting for a big explosion. When it got about 100 yards down the bayou, I grabbed my M1 and popped it on the second shot. I got lucky and hit the valve. The sucker went WOOOOOOOSH and danced around for what seemed like several minutes. When it was done, I picked it up and we threw it in the trash. Since then, I've seen Mythbusters and they busted the blowing up scuba tank myth, but I have to wonder about propane. I'm lucky the old camp was so well ventilated or I'd have died in my sleep from the leaking gas. I'm glad I'm a non-smoker too.