http://lianethomas.point2agent.com/blogs/corona/archive/2009/07/03/cookout-preparation-and-safety-tips-for-backyard-grilling.aspxMake Sure Your Tank is Ready: - A damaged tank - consumers should not try to repair damaged tanks. - Obsolete tanks - tanks with round- or star-shaped handwheels do not contain Overfill Prevention Devices (OPD) and can no longer be filled. - Empty tanksenCommunityServer 2.1 SP1 (Debug Build: 61019.2)