assembled in a cleanroom doesn't mean jack as soon as it is taken out of said cleanroom.... Poseidon claims that they use a non o2 clean lubricant during the milling process, and technically yes you can't get all of that out, BUT the valve is actually the most critical part of the whole process as the gas makes a HP 90* turn first and then goes into the first stage where it usually makes another two 90* turns at HP before being knocked down *one for the seat, one for the SPG*. Combine this with most tanks not being O2 clean when they get to you where most of this stuff is happening. Very few valves are certified O2 clean out of the box, the valves have high flow in and decently high flow out, this is your concern and where most accidents I've read about actually happened including Rick Allen losing his arm....
Get them O2 cleaned, as simple as simple green in the ultrasonic, proper O2 lubricants, and viton O-rings and you're good to go. In my opinion the DS4 is a terrible choice for an O2 reg if you're at all concerned about the flow of O2. It has an extra 90* bend, and it is a diaphragm which is prone to burning and most diaphragms used for O2 use show signs of this on rebuild.
Balance Piston Din First Stage "For Pony / Stage Bottles!" "Nitrox Ready!"
This is what I use, though any old piston first stage is really the ideal O2 regulator. Scubapro MK2's are great for used ones since you can get them for basically nothing, and the parts kits are freely available for like $9.
uncfnp how does it cost you almost $200 to clean a reg? Airtech does it for $30/stage plus parts and they're the expensive guys... So maybe $100 total if you have a reg with expensive parts kits? Northeast charges average $50 and everything is O2 clean, so shouldn't be that bad...
