When purchasing a regulator you should consider the following
Other Back Gas regulator considerations
There is a bolt snap (piston bolt) tied to the long hose near the regulator to clip it off to your starboard chest D ring when breathing a stage/deco regulator.
Apex have a half inch regulator hose at the first stage - you really want to replace this custom hose with an off the shelf one so that if it blows you can get a replacement easier. This may tempt you to use adapters, however Apex do a half inch plug and O ring (part numbers AP1487 & AP1410 respectivly) which you use to block the port and then use the other standard size ports.
Regulators go finger tight on the hose so that you can interchange them as required underwater - this is extremly important if you have a deco regulator failure as lack of decompression gas may extend decompression by100's of percent. This is one reason why the Jetstream possibly looses out - the story goes that the little needle thingey on the downstream valve will bend when hit with the slug of water (i.e. the water that got in your reg whilst you where changing it). I don't dive Jetstreams and don't know if this is a fairy tail or what but as I have heard this on different occasions from 3 or 4 Posedin Service technicians and the UK importer I am prone to beleive it ..any way the fronts don't come off (see above) - Any of you jetsream divers out there who want to try it and get back to me go right ahead.
Consider keeping all your regulators the same - many people consider a lower performance regulator as the deco regulator - only going to be using it shallow .... However if you have a main regulator failure at the beginning of a dive whilst kiting up and your regulators are the same you can swap them and not compromise your regulator performance on the dive. There are some other reasons to consider deco regulator performance - check out the stages / deco section here.
Also check the hose mounting and routing section - follow this link here
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