Replacement handle nut for Joe B tank valve?

Well I had to take a look for myself.

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So I pulled it off mine.

There is a washer at the base.

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The knob

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The spring and nut...

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I will have to go outside to see what the thread is on the nut though it does not seem be metric.
 
That’s it. Wow, $8.98 !!! 

I retired from the sheriff’s department dive team 12/31/21 and donated my save-a-dive tool box that had spare parts and O rings and there were at least 10 of those I salvaged from old tank valves and would have gladly sent you one. I also used to make stainless steel screwdrivers for those nuts with a notch to clear the screw as it came up through the nut. Being stainless I never had to worry about it rusting in the dive tool box. 

Randy