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predecessor is something that came before the current version. SEI is the successor.YMCA Scuba is no more. But you can still contact them and get a new card.
If you have not been in the water in awhile, I strongly recommend a refresher course. SEI is the predecessor to YMCA scuba. Contact your nearest SEI instructor if you need help with your card.
Welcome to SB.I was certified by the YMCA many years ago and don't have a c-card anymore. However I do have my paper certificate. Is there any way I can get a new c-card from the YMCA and is my paper certificate valid proof?