Blacthorn
Contributor
If I was going to buy a used D400 (just the second stage) what should I be looking for before I buy it? I will, of course, have it completely overhauled and checked out by a SP dealer, but that would be after the purchase.
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realdiver7:DA Aquamaster will have all of the answers for you. If you don't have a D400, I would strongly advise that you buy at least one. I have several, and use them for all of my diving. No doubt, the very best regs I have ever used!
Some are easier to fine tune than others, depending on how much they have been used, how much metal is inside vs. plastic, and how well they have been taken care of. Some techs don't like to tune them because they take a little more time and skill to get it right, but once they are tuned, they are the easiest to breathe from than anything I have ever used. I have made a hobby out of learning how to tune them, and then tuning all of my own. Parts are still available for these as well.
You may want to clarify in your post if you are actually going to see, hold, and test the D400 before you buy it, or if you are buying based on a picture and description. If it performs well at all, and if it's not corroded or damaged on the inside, then I would highly recommend that you go for it!