No, the Cyklon X is both the first and second stage set seen below, left -- and the Cyklon 5000, right, is another older regulator model, sharing the same second . . .OK so the Cyklon X is the current metal second stage and the 5000 is the first stage
I can see I got a lot to learn about this brand.
The other one that's mind boggling to me with how many models of 1st's and 2nd's is Scubapro.
Poseidon doesn't seem as bad.