In case you are wondering, there is no difference in the square label and the round label RAM....other than the label and a slight difference in the front can. If you are rebuilding a RAM, you really should check out Vintage Double Hose, everything you need to do the job and a forum with some really good DH experts. If you intend to dive the reg and I encourage you to do so, you really should consider upgrading the diaphram to one of the silicone ones. Even if yours is in good shape, the improved performance of the new one makes it well worth doing.
Luis, my Phoenix is packed and leaving tomorrow for 2 days of diving with Silent World . A warm up for Sand Dog!