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Valves are not rated, the burst disc in it is.

That looks more like a vinyl coating than paint. Not all were galvanized under the vinyl.

Mono vision contacts is also an option, one lens is for far and one for close. Use the close lens in the non dominate eye. The brain quickly adjusts to the two different lens and you don't notice it. I did it for years not just for diving.

Look familiar? 5660 Old Sunrise Hwy, Massapequa, NY 11758 - Owner & Property Information | PropertyShark

Seems removing the bonnet nut and broken stem and using a screwdriver to crack open the valve is the simplest way.

Can't help you.

Rust causes paint to blister above it, you see it on cars. The same with tank epoxy coatings, if no blisters or flaking epoxy is present you can assume the underlying metal is rust free. Never had a shop refuse to test an epoxy lined tank.

The only 72 explosive failures I am aware of took place in the 70's before yearly inspections became the norm and even then it was mostly out of the country where compressor and tank maintenance wasn't a high priority.

Having the number is one thing, having the hydro facility accept it without official documentation from the is the problem. I personally know Luis but telling a shop this is the REE my friend Luis calculated ain't going to fly very far. I fill my own tanks and know how to calculate if my tanks...

This is it. Plus ratings and hydros'

Vintage divers are very protective of their 72's. There was an in-depth thread about hydros and 72's in the vintage diving section. It popped up again a couple of months ago here. It will tell you just about everything you need to know. I'll see if I can locate it. Couv might know where it is.

Is this the same place that gave them the plus the last time. If it is I would go back and talk to them about it. They have the test records that will show if it passed the plus requirement.

Comparable to the tanks used on the old Nemrod and Fenzy BC's

They can be converted into transfill whips or pressure checkers.

I made the ( modern 3/4" ) triple manifold using a combination of a USD 3/4" double manifold and a USD J valve.

I used the split round stock to make triple bands for a triple 30's vintage replica set..

Judging by the yoke and the large recess in the front can I suspect it may be a Bio Systems non-mag. Bio Systems made a number of copies of the USD non-mag for the Navy after USD discontinued two hose production. A even rarer bird.

I know Alec, have dived with him at vintage diving events.

I had two of them, first one developed a leak in the bladder, the second was retired when I bought an Edge.

One man's trash is another man's treasure.