ew1usnr
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I have a US Divers Conshelf 21 that was purchased new about 18 years ago. It still works fine, and has never given me cause to complain. I also have a Conshelf 12. It is the same as the 21 except that it has a chrome case instead of plastic. The metal case is beautiful and it breathes great. Save your money. Have your old regulators serviced and just go diving.