Costco is currently stocking 20 lb propane tanks under the name FlameKing.  2 out of the three that I bought on June 12th were defective and could not be filled.  I complained to the company and they called and told me that the only way to get a good one was to keep taking the defective one back until I got one that could be successfully filled.  Not how I want to spend my time.  A lame answer, indicative of a an importer that has no idea what they are doing.