Trading up your 20lb tank? Beware of Blue Rino.

Just a heads up. I know most of us that have our tanks refilled will ocasionally (or at least have thought about it) exchange our 20lb tanks for a better looking one at the tank exchange. Blue Rhino is installing thier own proprietary OPD valves on the tanks, phazing out the standard OPDs, so your refiller may not be able to refill one of these tanks.. Look for a triangular indentation on the valve body where a magnetic ''key'' goes to ''unlock'' the valve for filling. Not all tanks have been changed over yet.