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Hallmac is absolutely correct. To summarize your choices:If all you want is the second stage only, ask your dealer to sell you part# 129080.
It is what you are looking for.
Yes, he can order only the second stage. Infact you may be able to purchase it directly on the aqualung web site, you may have to pick it up there but it wil prevent him from saying he can't order it alone.
Part# 1209080 is the legend lx, not the octo, so you will not have to change anything.
Maybe I'm stupid, but I haven't been able to figure out how to order non-standard reg parts (2nd stage only "black" regs, octos, or other reg pieces) via Aqualung's online ordering system.
Thanks for the useful post. Exactly what I was looking for.If all you want is the second stage only, ask your dealer to sell you part# 129080.