OK, then have you recieved it and used it yet? I am wondering how it compares to the last one you had?
Having some spares is a good idea. I am not sure out on a rocking dive boat is a good place to pull those infernal clips to get at everything. In my opinion, the fewer times those clips are pulled the better. It is hard on the clips and the regulator both. If something works decent and I have no reason to suspect bad things I tend to leave it alone. There are rings that replace the clips but they are more rare than hen's teeth. My DA, the one I am keeping, has such a ring and it makes getting at the innards to fine tune it a snap and this is the only reason it performs better than the "old feller"--the easy access to fiddle with it. If they both had rings to snap the cover off the old feller would give up it's secrets much more easily.
You know, for more than a decade, used by navys, Cousteau, and sport divers when diving was thought to be a serious undertaking the DA AquaMaster was US Diver's (when they where the premier company) workhorse regulator, it don't say AquaPlebe, AquaNeophyte, AquaBeginner, nope, it is the AQUAMASTER!!! and I am happy that you once again have one of your very own. Good luck with it. N