call "American Tank" in San Diego, Calif. He knows everything! He's been doing it for 35 years and knows absolutely everything and can answer all of your questions. You can look him up on line. He replaced my tanks and saved me 6 thousand dollars. He also made me my 6 gallon rum tank. He flies all over the country replacing tanks in "hard to replace situations" but will do small jobs as well. Honest, reliable and does reasonably priced excellent work.