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Well, depends on what you consider mainstream - I would consider Mares to be mainstream - do not think of these as made by Dacor. The D12 & D16 are the same service kit as the current Mares 16/22/32 1st stages. Only the D20 (dual swivel on primary hose) has a dedicated kit, and I think that is just to accommodate a couple of additional O-rings for the added swivel. 2nd stage (are they both Vyper?) is of course same kit as Octo MV. Plus, most 2nd stages that are that old you would have a hard time replacing any non-service kit part, such as a cracked box, but since it is the same as the Octo MV that is not an issue - although if you break that wire mesh on the purge, you may wind up with a plastic yellow replacement if black is no longer available. (I was able to get black once for a customer, but that was NOT in the last couple of years.)As @JackD342 was getting at, there are just too many other "mainstream" regs available now. The potentially limited service options for Dacor would deter me.
I would consider Mares to be mainstream - do not think of these as made by Dacor.
I have no definitive source for who is (was?) making those regs for West Marine. But I took a close look at their website, and I am confident that they have no relation to any Mares produced products. That was probably a pure licensing deal, so Mares could keep the Dacor trademark from lapsing. (use it or lose it)True. I suppose I was thinking of Dacor as being rebranded and sold by the West Marine boating supply company.