Poseidon Cyklon

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Cyclons are OK, side breather just like the ODin, but its a demand second stage, and, doesnt give quite as much air as the Odin does at depth...

I would recommend the Odin / Jetstream.
I have four of them, and I love them...
 
I just bought a Cyklon 5000 off of Ebay(OH MY GOD YOU BOUGHT LIFE SUPPORT EQUIPMENT OFF OF EBAY!). I already own an Odin/Jetstream.

The Cyklon sits a little closer to your face which I found nice for U/W photography-the second stage doesn't get entangled in all the photo stuff like my Odin. And the smaller, closer second is less in the field of vision than the Odin's

But, the Odin is the superior breather there is no doubt about it.

The Odin/jetstream breathes like no other reg. there is so much air and so fast-for some a little too fast. The difference between the two is minimal but noticable.

Since the intermittent pressure of the Cyklon is so high(about 175psi) it is not recommended to use a non-Cyklon reg as a backup to it.

I would but the one I could get off of Ebay the cheapest. I guess I still favor the Odin.
 
Poseidon had the first single hose scuba regulator with the 2nd stage at the mouth, back around the mid 1950's or so. Their original reg was very similar to the Cyklon.
The design on the 2nd stage hasn't changed much for over 30 years, attested to by being able to use the same 2nd stage rebuild kits on the 300 as the newer 5000. The 2nd kit consists of a couple o-rings, a little rubber plate, and a new zip tie for the mouthpiece.
They're an extremely robust & hardy regulator, & the first single hose to come out with antifreeze protection.

Not too long ago a Cyklon was found laying on the bottom attached to a rotted out pony bottle. The rig had been down for over 2 years. The reg was rinsed out & the darn thing not only still worked w/o any tinkering, but all that was required to put it back into service was a simple normal service kit.
 

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