I saw a thread on this forum where a SB member says that for about 10$, one can add a breathing adjustment knob to a Scubapro S555 second stage. My question is - where can one buy these parts, and how easily are they installed?
Scubapro S555
- Thread starter t1mm
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a s555 can be upgraded to a s600 i know that but i do not know the cost. i would think a dealer would have to order it. but i know it can be done as i have a s555 that was upgraded to an s600 and just had it turned back into a s555 for my kids octo.
the dive shop had upgraded it when i got it. so dont know the cost. it will perform the same as the s600. i have two sets of sp regs for my kids both with s600 primary and one octo is that 555 the other is a s600 downgraded to a s555(adj knob removed) with them being young new divers i wanted simple octos but good breathers. the cracking pressure is set a little higher for octo use but a very nice set of regs.
Cheers for the information!
I agree an adjustment knob is not needed on an octo, but it can be used to detune the reg for octoi use - and then to ease the bretahing effort if it ever has to be used.
Converting an S600 to an S555 just for octo use is a bit ill infomred and a total waste of money and tech time.
If it matters, I also do not belong to the "detune the octo" school of thought. Once the second stage floods detuning does not matter, so you give up inhalation / cracking effort for no real advantage.
Converting an S600 to an S555 just for octo use is a bit ill infomred and a total waste of money and tech time.
If it matters, I also do not belong to the "detune the octo" school of thought. Once the second stage floods detuning does not matter, so you give up inhalation / cracking effort for no real advantage.
here was my thought on removing the adj. knobs on my kids regs. i didn't want a panicing 12yr old to grab an octo and have it set to breath hard and have him panic again. so i had them dumbed down. in the future if they want to add them back fine but as a general rule i think an octo should be grab an go. no adj needed. and since you never no who will need your octo,nd not know the diffrent regs, i think it should be just grab and go.
halocline
Contributor
I really don't think you're giving your kids enough credit, and an adjustable reg doesn't mean that adjustment is needed, only that it's possible.
Honestly, if you're really concerned about your kids staying calm during an unexpected air share, which is a good thing to be concerned about, you should consider setting them up with a modified long hose and a bungied necklaced alternate. That will do two things for them, 1)if they get mugged for the reg in their mouth, which is certainly a possibility in an emergency, their alternate will be right under their chin where it belongs. 2) sharing air with a long hose, in this case probably five feet, is MUCH more comfortable and less stressful than trying to manipulate a 30" hose between two divers.
Honestly, if you're really concerned about your kids staying calm during an unexpected air share, which is a good thing to be concerned about, you should consider setting them up with a modified long hose and a bungied necklaced alternate. That will do two things for them, 1)if they get mugged for the reg in their mouth, which is certainly a possibility in an emergency, their alternate will be right under their chin where it belongs. 2) sharing air with a long hose, in this case probably five feet, is MUCH more comfortable and less stressful than trying to manipulate a 30" hose between two divers.
LeadTurn_SD
Contributor
Thanks for posting that!
Correct handling on the surface is all that is usually needed. Most of my octo's are non-adjustable, classic downstreams; and all are tuned like a "primary". Yes, they'll freeflow in a heartbeat on the surface if mishandled, but just handle them carefully as you enter the water, and once full of water they are perfectly fine.
Best wishes.
As a father whose son started diving at age 12, I appreciate the sentiment.
But it is a little misguided. Assuming the adjustment knob on the S600 gets cranked all the way down, it won't be any worse than a detuned S555 "octo", particularly if it gets detuned to the 3 inches of water range. The difference is that your child could do something about the diver adjustable S600 while they are stuck with what they get from a detuned and non adjustable S555.
And there are two ways to detune an S555. The right way is to increase spring pressure by screwing in the knob on the end (allen wrench adjustable rather than finger adjustable as on the S600, but exactly the same function) and the quick way (for a tech adjustuing the reg as it becomes a single adjustment) is to just screw the orifice in farther. The latter method however will also lower the lever height and that reduces the working range of the valve and reduces flow rate.
So be sure to check the reg to ensure it starts purging with an eight inch or less of purge button depression. If it does not, it is not properly adjusted.
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