Are DIN Regulators Different In The US Vs Europe?

We dive into the real differences (and surprising similarities) between European and American DIN fittings, including 200 bar vs 300 bar DIN threads, M26 oxygen-compatible fittings, and the legacy of the G5/8 standard. Whether you're shopping for a new regulator, planning a dive trip, or just curious how universal DIN really is, this video breaks it all down in simple terms.

I also talk about compatibility with Nitrox cylinders, valve thread standards, and when you actually need to worry about mismatches.
Leave your scuba questions in the comments with #AskMark and I might feature yours next.
Thanks for watching and safe diving

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Disclaimer: The information in this video is not intended nor implied to be a substitute for professional SCUBA Training or recommendations for every manufacturer. All content, including text, graphics, images, and information, contained in this video is for general information purposes only and does not replace training from a qualified Dive Instructor or specific requirements from equipment manufacturers.

🔎 Related Phrases:

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[ScubaDiverMagazine]

Do you dive with a DIN setup? Ever had issues traveling between Europe and the US? Let’s hear your story

[rayamis]

I am in a German dive club. And yes in Germany there are "special" fittings for Nitrox. (Based on standards for tanks with 100% O2). So our club did all our Nitrox certification in the Netherlands, where anything below 50%O2 only requires "Normal" DIN fittings. It must be said Germany can be a bit finicky with "Standards", BUT I still have issues with Whitworth, Metric or Imperial screw threads. So there is that!!! Happy New Year Mark & all.

[LukasNiebel]

We actually had this scenario a few days ago.

We got an Aqualung Nitrox regulator oxygen cleaned for our dive boat and it had a 5 thread din connector for 232 bar but the 15L O2 tank is a 7 thread 300 bar valve.

Never knew this was a thing, so thanks Mark for the video and thanks to the person for asking the question, it couldn't have come at a better time for me 😊

[dediver]

To be honest: Even the Germans almost never use this special Nitrox DIN. The typical Gerrman diver travels to Egypt with his ordinary 300 Bar DIN and dives with Nitrox there. And in German lakes, there are not that many diving scenarios that would require Nitrox at all, IMHO.
I'm from Germany too and used my DIN regs worldwide. I did over 100 dives in Palau with my DIN.
So, basically, there are today only two options worldwide available: 300 Bar DIN and Yoke (is a joke ;-) ). All the other stuff (Nitrox DIN or 200 Bar DIN) is rather theoretical. You hardly find someone actually use them (in recreational diving!!). Fun fact: I own an older MK20 with a 200 Bar DIN. Most of the time, there's nothing wrong with them, since 300 Bar tanks are pretty rare.

[AndrewLarssen]

I heard that the DIN vs M26 standard was introduced globally in the EU. It is used for industrial and medical gasses as well. The idea is to stop people muddling up gasses. It makes much more sense where you have oxygen and air only but not blended gas. In EU any gas that is more than 22% should be M26. If you are using high O2 mix for deco where you need an oxygen cleaned regulator then it sort makes sense but for regular recreational nitrox up to 40% it adds a lot of complexity…

[barryinkpen]

I'm in Canada and have an old Posiedon Cyclone 300 reg that has DIN threads, but there is a protrusion on the end that will not let the o-ring seat in a 300 BAR valve. We have two common DIN valves on tanks with different thread depths; a 3442 psi valve is shallower than a 3500 psi valve. Modern regs fit both but the 3500 psi valve is very robust and angled to get the reg a bit further away from your head when diving.

[ivoryjohnson]

Thanks Mark for explaining how this works

[WhaleOnTour]

Everybody knows, there are just two connections. DIN and the wrong one😜

[timgosling]

Fortunately, it's easy to convert M26 Nitrox regulators to regular 5/8ths DIN. I've personally never met anyone who uses M26 but I guess there must be some.

[arjanwesselink]

Just came back from the Red sea. Guess what...all DIN and no leaking 1th stage to tank connections.

[RobWhitenoise]

#AskMark
Love your videos. They have reignited my passion for scuba and diving education. You mentioned that some DIN regulators are different for Nitrox. I got Nitrox certified years ago and never used a different regulator and I thought most regs are recreational Nitrox ready (not higher tech levels of mix). Does it really matter if the manufacturer builds them as “Nitrox Ready.” I guess I never thought about it because my first regular and current one have both been A-clamp, but I was thinking of getting a DIN reg for my next one.

[daveturton]

You tend to see m26 threads on rebreathers for the O2 cylinder. This is a safety feature so you don't get it mixed up with the diluent.

[bobs]

I live in the US and decided to go with a DIN setup so that I can dive with them anywhere in the world. I have recently come back from a vacation in Jamaica where I did 11 dives, multiple deep and wreck dives. I used the A-Clamp conversion that came with my regulators, DiveRite XT4/XT1. When pulling the A-Camp adapter off, I noticed a brown powder like buildup at the base of the A-Clamp adapter. Wondering if I should have my 1st stage serviced over the winter as a precaution. I don’t feel like I was breathing dirty air, but the buildup has me concerned. The simple answer I guess is, if in doubt get it done, but wondering if that is entirely rational. Thanks in advance for your guidance.

[fredr]

#AskMark - hey Mark. Thanks for all your great content. Can you please discuss the ins and outs of Partial vs Continuous Blend (and “banked” - if that’s different) nitrox? I know you need an 02 cleaned cylinder for PB but not for CB? Can you go back and forth between air and nitrox fills with CB or banked? Thanks!

[dtt]

why aren't all tanks able to accept din or yolk(a frame). i have din and was under the impression that every tank was designed with a din fitting and an adapter was used to fit yoke with an allan key.

[benheckendorn]

Hi Mark

#askmark
Why do we just dive with 200 bar, wouldn't make much more sense to get our cylinder filled until 300bar, so we would have much more air?
Thanks for the answer. 👌

[wombat]

Is this potentially an issue in the Caribbean?

[benheckendorn]

#askmark

My secould question, I just wonder why does a cylinder need to be air cleaned, if I switch from air to nitrox, I mean at the end, both is just air.

Why don't we just dive with EAN22?
I guess it wouldn't be a big deal to got 21% or 22% O2, so I guess not evern a certification would be needed, but we may could save the money for air cleaning, I guess.

[alhavill]

An additional consideration to the different DIN first stage thread count, is the tank valve thread count. In an effort to ensure that all my sidemount equipment works seamlessly at my dive destination, I brought my own modular right and left tank valves to swap-out when I arrive. I was recently on a trip to Mallorca (coming from Canada) and when I tried to install my tank valves into the shop aluminum 80’s the thread was different. No big deal, I just had to use their standard DIN values for right and left for the duration of my trip. It was an inconvenience that I will try to be prepared for during my next European dive trip.

[MysticalDragon]

Am I the only one who thinks that it's absurd the Europeans nitrox regs can't fit air tanks? So you need two regs with you if you dive a tank of air the first dive, followed by nitrox on subsequent dives.