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With an insatiable apatite for diving and the sea from a young age I read every book I could find about diving. At age 13 I got a two hose regulator and tank, already had mask, fins and snorkel. My older brother was married and had a pool and I practiced everything I read in the books. I began...

Voit made a convertible valve in the 60's and 70's. It had a large plug that could be removed and replaced with a J valve mechanism.

I agree the lack of a + is odd. I would like to see the bottom and the height and width. Personally I am only familiar with Scott SCBA's from the sixties, I can't recall if they had pluses. They had round hemispherical bottoms, not like the bottom on 72's

I had heard he retired. I haven't seen him since I was at the Sea Hunt anniversary at Silver Springs several years ago.

Not sure if Alex is still active in the company but they should be able to direct you to him. About Scuba 2000 – Scuba2000

At one time Scott Aviation made diving equipment and fire fighter SCBA's. They made a single hose full face mask SCUBA in the 50's the Scott Hydro Pack. These are probably Scott SCBA tanks repurposed for SCUBA. 3M now owns Scott. What say you Sam. 3M Scott Fire & Safety - Wikipedia

If I remember correctly Nemrod sold bump bottom tanks. Do not know anything about the valves on them. Are there any stamping on the tank that might indicate what brand it was sold under.

Originally the W J Voit Rubber Co. later the Voit Rubber company was bought out by AMF in 1957 when AMF began to expand it sporting goods line which at the time was mainly bowling equipment. My first tank and regulator I bought new in 1956, both are still in use..

I know the guy who made those, he was part of our vintage diving community.

Yes it will, it was originally used on 72's.

I think a quart should easily do it.

Why disable it, just don't use it. When the lever is in the down position it is no different than a K valve. That's what I do, all except one of my tanks have J valves.

J valves make good carry handles, no need to replace them. Gavilite is absolutely the best. Do not use the spray can buy a quart can and apply it with a foam roller, 3 coats. Let it cure 2 weeks before putting it in service. ZRC Galvilite

Sand blasting the vinyl is like sand blasting rubber, it doesn't work. I find stripper doesn't affect vinyl. Use a large knife with two hands and use a drawing motion. Not easy or fast but it is the best method I have found. Sometimes there are sections that have unbonded from the tank and peel...

I go 3000 with mine. It requires increasing the relief valve pressure setting.

All appear to be PST 72's. Top 2 sold by Us Divers. L surrounded by a C is Cochran Labs who did PST original hydros. The two yellow one are vinyl coated and may or may not the epoxy lined. There can be issues with rust under the vinyl coating and under the epoxy lining. Neither is an automatic...

The more you possess the more you are possessed.

The tanks have bushings without a hex head on them. They will be a pain to remove for hydro.

I believe Bryan at VDH had a set of those.