DH wrote this up for us: I recently took a propane cylinder for refilling and was turned away. The store employee said any tank older than 12 years had to be recertified. Sure enough, my tank was stamped 07 - 2000 as the build date. I was looking at buying new tanks for 30 bucks each. No one in this area does the recertification. Fortunately, there is Blue Rhino! I turned in four empty, outdated tanks and got four filled tanks for 68 dollars, tax included. The new tanks are recertified by Blue Rhino and have a sticker dated 09/17. These tanks have a standard fill valve and can be refilled anywhere. I have read that SOME Blue Rhino tanks have a special fill valve that only that company can fill. I have not seen one of these, mine have the standard valve. This is a way to get rid of your old, outdated tank, get a usable one, and save some money in the process. YMMV I have not heard of Blue Rhino refusing any tank. The store employee was too busy texting to look at my old tank Yes you are not getting 20 pounds but we think the service is a worthwhile tradeoff.