Tank valves needed

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Thanks Michael, the valve that I need is bigger than 25mm (26.2 mm) I’ll try to pick up an old 3/4 14 and see how it fits, the valve I need is definitely 14 TPI
Thread size and diameter engraved on this valve: 3/4 14
Robinet simple sortie g5/8 - 3/4 NPSM
 
Well I went ahead and bought 2 valves from divegear express but on my valve there is a recess where the o ring sits and this allows the valve to close metal to metal. But on the new valve no recess and it doesn’t close fully with the result that the o ring blew at 1000 psi.
 

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