Need Help With Air Venturi 74cf Tank

So here's my issue. I have the above tank with a Air Venturi 200 bar regulated valve. The Air Venturi fill station threaded part of the plunger that pushes on the valve is stripped out. So now I can't get the air out of the tank (tank is sitting at 4500psi). I've looked on many sites and the replacement part is out of stock or discontinued. Anyone know where I might find a replacement part? 

Thanks Les