Scuba Tech Tips #9: Servicing The Second Stage

20 19

Alec shows how to service your own regulator to make it easer to work and maybe last longer. This tip does not replace regular service from an authorized professional scuba technician.

***** Alec Peirce Scuba *****

▶︎ Series 6:
▶︎ Series 5:
▶︎ Series 4:
▶︎ Series 1, 2 & 3:

▶︎ Series 3:
▶︎ Series 2:
▶︎ Series 1:

▶︎ Series 2:
▶︎ Series 1:

SCUBA 2000
▶︎ Website:
▶︎ Facebook:


Rating: 4.81

  1. ventdesel says

    Any tip on where to get a cover? Or make one? Both my covers are gone.

  2. patrick holcomb says

    I was searching for the mk10/ r190 service info, not the weird descendant of the mk 2. patent resolved-souped up version of the us diver single stage/hybrid.
    The scuba-pro inventors of the "mk 10, 15, and 20" which eventually broke away from the (legal-ish crap, with no malice, ill-will, slander, or otherwise degradation of SP, affiliates nor individuals associated within this commentary in its entirety)
    "as perceived by the public", "alleged" hierarchal bullshit of scuba-pro and formed their own company, "ATOMIC" which were, in essence, the designers of the said designed units the original of the mk 10/ r190. the atomic company came out with 6 designs, i think, initially all based on the these units 2nd stages followed the relative same/similar pattern. A1/A2 single stage and 2 stage.
    Most don't know that factoid.
    my point is, how to obtain parts and seals for my mk10/r190?

  3. patrick holcomb says

    Alveolar, alveopalatal, or postalveolar click.


    absolutely annoying!

    Nervous habit, akin to "ahh, so, ehh …" ETC.

    It is a method of keeping the audiences

    attention and actually distracts from the

    message being/attempting to be conveyed.

    Try a "pause" instead. It draws the listener

    back in & the spoken word holds more

    meaning/is more captivating.

  4. Widget says

    HOw many takes does this take? This had to have been scripted because no other scuba instructional video has this much professionalism in one take!

  5. Francisco Alister says

    Hi Alec. Just one note, why you aware from pressing the lever?. I think that was well set in your other video that, while the rubber cap or plug are in place in the first stage, there is no chance for the water to came in through the second stage. Thank you for your videos and for give us technical reason instead of myth or "i heard it to a friend of a friend".

  6. martin bachmann says

    Brother Alec, another VERY well presented instructional video from you! Quick question: I have read that disassembled 2nd stage parts can be cleaned by soaking in a 50% white vinegar/ 50% distilled water solution. What are your feelings on this? And secondly, you mention (for in-field care) washing 2nd stage in "soapy-water?" Are you using regular dish-washing liquid in water to do this? Thanks again very much for your awesome videos!

  7. Mohamed Haji says

    Hey Alec, just bought a Dacor H.U.B bcd with Viper Tec 2nd stage regulator, used of course. I cleaned and took apart the 2nd stage, but I forgot where the o'ring goes on the poppy seat. Does it sit just above the threads on the left or in the groove around the allen keyed adjustment knob.

  8. Tallishyeti27 says

    Hi there, I just bought 2 Dacor xle pacer regulators and a couple aqualung bcd's of the same vintage. None of the equipment has been used in a couple years and I was wondering what kind of service the regulators and the bcd's need to go through in order to dive again or if they will ever be serviceable. Will the dive shop be able to get parts for the reg's or are they just gonna tell me to buy a new one? I'm on a pretty tight budget so I'm hoping to be able to work with what I've got. Thanks in advance.

  9. Charles Lagerbom says

    Appreciate your tech tips. Thank you.

  10. Soheil Moradi says

    hi i love your video thabks

  11. Michael Scorzelli says

    Could this same cleaning / servicing be performed on a scubapro s560?

  12. BCBOYS92 says

    Has anyone ever had a noisy buffeting from an exhaust valve in the second stage?

  13. TheCaesar32 says

    That was very helpful and so easy regulator works so much better now Thanks!

  14. reefseeker says

    No disrespect here, just inserting my experience and opinion. I have been diving for over 40 years. At least 80 dives a year. I have paid for 2 regulator service charge in my whole life. First one I was talked into it and it was a fail. Not sure why I did the second one. My reg for last 10 years plus is a Scuba Pro S600T and MK25T , actually I have a few of them. I have never serviced any of them, not once. After a 10 day dive trip I just wash it and squirt a little salt away into both stages. Let it dry and put in a bag and keep in a dry place. I always bring a backup with me just in case and rebuilding kit I never used. You say once a year or even 2 times a year. I could buy a new one and be ahead of the game right now, I don't trust any service place, no one would be more careful than myself or better than factory that builds them. I have checked them with a Intermediate Pressure Gauge and check to be sure they breath within 125-140 and adjust if not. I guess if you can't adjust then maybe time for new parts. A spring maybe. Leaving for Indonesia again in a few months. Bringing same reg and same spare.

  15. bluelineaquatics 14799 says

    Hey Alec love the videos. I'm new in the sport, and have been wondering, if a LDS doesn't service the specific brand regulator you may purchase, say from the Internet, what can you do to service it? thanks again.


  16. Sean Dillon says

    Alec, any chance you can expand on this a little more with a follow up video?  Specifically how to check and monitor the health of your regulators.   If you acquire the correct tools, is adjusting the 2nd stage something the average dive could or should do?

  17. Bruce Wilbur says

    Alec, I know you don't like to promote brands, but I've been reading that some regulators are more costly to service than others. I guess it is the cost of materials and extra labor. Is there and easy way o find out which regulators are expensive to service?

  18. Carlos Aguilar says

    It's a real shame that the manufacturers make it such a taboo subject to service one's own regulators.

    I learned how to do it by going to authorized workshops when I worked at a dive shop, however, there is a huge difference between someone that is a technician and one that understands the nuances of regulator service.

    Schematics and tools are available on the internet, and slowly but surely parts kits are becoming more available, too.

    Years ago when automobile manufacturers tried to insist that only original factory parts should be used, an aftermarket mecca was created. I'm really surprised that someone hasn't sued over anyone not being able to buy parts.

    I'm an independent scuba diving instructor now. Working with customers hands on has created a community that is sometimes lost in the business of scuba.

    I think most adults are wise enough to know their limits of their technical abilities. Some might even be better than store trained.


  19. Michael Kopa says

    Love these Tech Tip videos, Alec! Great information to have; thanks and keep up the great work!

  20. matt kukla says

    cool tips thank you

Leave A Reply

Your email address will not be published.

This website uses cookies to improve your experience. We'll assume you're ok with this, but you can opt-out if you wish. Accept