Author: j. scott landon said:
     
     
     
 I wouldn't own one of those pieces of high priced junk.  i stick with 
poseidon diaphragm first stages.  if i really want a piston first stage, 
i'll buy a sherwood.
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What do you see as the disadvantage of a balanced piston first 
stage?

They have less moving parts and less rubber parts than a diaphragm 
regulator.

I have been happy with my piston first stages (scubapro Mk 5, Mk 10, 
USD Aquarius) although they are more difficult to "tweak" than 
others.  Adjusting the IP involves adding or removing shims.

I've also been happy with the performance of my diaphragm first 
stages (USD conshelf 11, 21, Poseidon cyclon), and I can easily 
adjust them.  The cyclon is a bit more complex than the USD, and is 
unbalanced.

I've even got a 1958 USD "aquadiv" regulator, that is essentially 
the same mechanism as a modern conshelf. (I don't use it, of 
course).

I use the scubapros almost exclusively now, (mainly because they are 
newer). I'm interested in your opinion of why a piston regulator is 
inferior.

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