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Have you tried contacting Marine Depot's Customer Service?
"Customer Support
Our staff members are experienced hobbyists with extensive knowledge in marine aquariums and reef keeping.

Email us at [email protected] or call us at 1-800-566-FISH (1-800-566-3474) or 1-714-385-0080 with any questions. Our store hours are: Monday-Friday, 7am-6pm PST & Saturday, 8am-4pm PST.

We are staffed with reef hobbyists with vast saltwater and reef keeping experience. We will be more than happy to answer any of your questions."

They still sell the M3 regulators.
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