7/8 UNF

[Gone for diving]

They are pretty fragile when empty. 300 bar is worse than 200 bar in that regard.

Worse comes to worse, You could try cutting it down to 200bar depth on the din thread....

I don't have the tanks here to take a pic,
but I have cut them down to use with a yoke adapter.

 

[The Chairman]

The tap works fine. Just make sure it's a straight one (parallel) and not tapered. This will work on a DIN tank: G 5/8 - 14 TPI BSP Parallel British Standard Pipe Tap [M_M_S] | eBay

 

[Gone for diving]

Its pretty hard to find a 5/8npt tap,
But I have run across what I believe to be 7/8 npt on certain industrial tanks,
Had Sherwood valves on it.

 

[rob.mwpropane]

Worse comes to worse, You could try cutting it down to 200bar depth on the din thread....

I don't have the tanks here to take a pic,
but I have cut them down to use with a yoke adapter.

I had also forgotten about this. I've see Tracy post pics of valves cut down. I guess I thought I locked it away in the back of my head but apprently not! Great idea... again!

When you do that do you setup a jig or ??

The tap works fine. Just make sure it's a straight one (parallel) and not tapered. This will work on a DIN tank: G 5/8 - 14 TPI BSP Parallel British Standard Pipe Tap [M_M_S] | eBay

Thank you Sir, much appreciated for the link!!

 

[Gone for diving]

When you do that do you setup a jig or ??

I used a milling machine.
But as tracy shows in the link.
Hacksaw works, but it's all about the operator. add a small square and file... you can do a nice job,
OR zip disk in a grinder, and sanding flap wheel.

Do you think this can pass visual?

Inside looks great

scubaboard.com

Found a pic

 

[Tracy]

When you do that do you setup a jig or ??

Yeah, a jig. I definitely do that.
Or just eyeball it and start cutting.
One of those two things is definitely what I would do.

 

[-JD-]

@rob.mwpropane

I can't help you on the tap (I don't think so, but I have to check my pile of inherited taps)

I can mill them for you if you want ...

 

[The Chairman]

I love your guys dedication to salving valves. Great ideas!

 

[Gone for diving]

I love your guys dedication to salving valves. Great ideas!

Have to justify our tools somehow

 

[rob.mwpropane]

Have to justify our tools somehow

So true