MK25/S600 Yoke--> DIN/Yoke

[ColinCB]

I currently own a Scubapro MK 25/S600 with a Yoke tank adapter. I'm interested in using a Steel tank however doing so requires using DIN. What is the cost associated with switching to my Yoke to DIN/Yoke?

This is what I have been told.

My current reg is Yoke only. I need to buy a DIN adapter to replace the Yoke adapter on the MK25. From there I buy a DIN--> Adapter when I'm not using DIN. Correct?

 

[elan]

Using steel tank does not require using a DIN regulator. Many tanks including HP come with a so called Pro - valve which can be used with both yoke and DIN regs. You do not have to invest any money into the conversion if this is the only reason.

 

[Bubbletrubble]

elan is correct. Many steel tanks nowadays come with the convertible DIN/K valve. Just screw in the insert, and you can use it with a yoke-configured regulator.

What you've been told is also correct. In order to use your reg with a DIN only tank valve, you will need to convert the reg to DIN. This is a very simple conversion process and should only take a couple of minutes with the right tools. Cost of the DIN parts should be $50-$100. Once you convert your reg to DIN, it would be a good idea to purchase a DIN-to-yoke spin-on adapter ($25-$70) to add to your save-a-dive kit. Mine has come in handy on several occasions.

Since you haven't bought the steel tank yet, you can save yourself some grief by purchasing one with a convertible DIN/K valve. Then, you wouldn't need to do anything to your reg.

 

[N2DeepInAz]

Correct on the parts & process needed. You will convert your MK25 1st stage to a DIN valve config. Then if you need to use it on a yoke valve you will need a DIN to Yoke adapter.

This is an example of what you'd need to do the conversion.
ScubaPro "300 bar" Din Conversion Kit for MK16, MK18, MK20 & MK25

You will also need to look for a Yoke to Din adapter but those are pretty easy to find.

Good luck! Hope this helps.

 

[ColinCB]

I thought DIN is required with higher pressure tanks such as a Steel 120 @ 4500psi?

 

[Bubbletrubble]

I thought DIN is required with higher pressure tanks such as a Steel 120 @ 4500psi?

Are you sure about the service pressure on that steel 120?
For scuba applications, I have seen HP120s with service pressures at 3500 psi or 3442 psi.
The convertible DIN/K tank valves typically have a service pressure of 3442. My circle of dive friends has been using yoke-configured regulators on their HP100 tanks for years. They've never had any problems.

Besides, where do you plan on getting 4500psi fills?

 

[N2DeepInAz]

Are you sure about the service pressure on that steel 120?
For scuba applications, I have seen HP120s with service pressures at 3500 psi or 3442 psi.
The convertible DIN/K tank valves typically have a service pressure of 3442. My circle of dive friends has been using yoke-configured regulators on their HP100 tanks for years. They've never had any problems.

Besides, where do you plan on getting 4500psi fills?

The only thing you'll need to double check is that your regulators will handle the higher pressure that most steel tanks will allow. Check with your manufacturer to make sure your regs will handle pressure above 3000psi. Being as it's a Scubapro reg, you are most likely fine as they are built to handle pressure up to 4350psi, if I recall correctly.

You can use a lower pressure rated set of yoke regs on a higher pressure tank but at some point they may give out and you could blow out the regs. I've seen this happen with a buddy of mine who constantly used regs rated for pressure up to 3000psi on his steel 120 3442 tank, which was usually overfilled to 4000psi. At that point you just send them in and have them serviced and you should be back up and running.

 

[adm3745]

I thought DIN is required with higher pressure tanks such as a Steel 120 @ 4500psi?

leisurepro sells them for $50 and I think they go for around $75 at Scubapro dive shops. I think the DIN connection is an all around better choice.

You should be able to find DIN to yoke converters online for around $25 incase you can only get Aluminum tanks.

 

[cwkline]

You may want to check the service pressure rating on that tank. If it is 3500 or above, you will have to have a DIN connection. If it is 3442 or below, you can use the yoke connection.
I'm not sure of the 4500 psi tanks, I've never seen one but that doesn't mean they don't exist. Could you provide some more info on the tank? Is it possibly a carbon fiber wrapped tank for fire service?

 

[ColinCB]

As for the 4500psi fill pressure, I was thinking of the SCBA tanks, that like cwkline said, are wrapped in CF threading for strength.

On the topic of tanks, what are the advantages of using a Steel 80/120 vs an AL 80?

From what I can tell:

Steel 80 vs Al80 Advantages:
Less weight to carry since tank is negative, smaller air cylinder.

Steel 120 vs Al80 Advantages:
More air, less weight to carry since tank is always negative.

Steel 120 vs Al80 Cons:
Cylinder is HUGE. Requires DIN