Gentlemen: I have a vx-10 with the sealed first stage. I also have Poseidon Odins. On the VX-10 you unscrew the first stage metal end cap and replace it with a new metal end cap designed to hold the silicon fluid. The end cap on VX-10 is much, much more sturdy then the anti-freeze cap for the Poseidon first stages. The Anti-Freeze cap for the VX-10 is thick metal and design to protect the fluid containing rubber cup. The anti-freeze cap for the Poseidon has a exposed rubber cup which can easily get damaged during a dive. I don't put anti-freeze caps on my Poseidon reg's any more. The Poseidon anti-freeze caps I had got damaged on a boat ride to a dive site some time ago. During that dive (and dives since) the reg has worked just as well without it and I do much of my diving in 37 degree f. water. I can't say that the Vx-10 really needs a anti-freeze cap because this reg only gets used on my EAN50 to 100% O2 (mostly EAN80) stage bottle. Therefore I only use this reg during deco. at shallow depth. The water at this depth during the spring time can also be in the 36 - 40 degree f. range. But during most of the summer the water temp. on shallow hangs can be a warm 50 to 55 (maybe even 60) degrees f. Gary McGee Detroit, MI USA Great Lakes Wrecker
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