Airforce tank leaking. Need help Darksiders

[Rob112o]

I need some help. I have 2 slow leaking tanks, a standard and a micro. After being left for 2 weeks, give or take, the standard seems to be holding at 160 bar. The micro tank seems like it will keep bleeding down. it was at 90 bar when i hooked the pump to it and started pumping. I've located the leak as suggested on a few threads as you can see in the image provided. I've done the putting power wheel to full power and dry firing it a bunch of times. It is leaking out from the area between the brass piece and the area it seats in:


Now, is this something I can fix or should I send it away? I had a thread up previous, on my TalonSS, but after discovering the leak. I just put her away. Oh, and both the tanks are dated 10/06 so they are old. Though they are both in great condition.

[Big Bore Bart]

   These are very simple to fix. The tools needed are a flat screwdriver and a face pin spanner (or suitable substitute a pair of drill bits) Degass, remove the tophat, replace all o-rings, reinstall tophat, fill, and go shoot.   

[Rob112o]

Ok, I got the valve out. So that oring is hard plastic behind the brass piece.


So is that the only oring?
I'm not sure if I was suppose to take the valve stem out of the brass piece?
It looks like there is a oring inside of the brass piece where I removed the valve stem.
How does the valve stem part retain inside the brass piece when a shot of air is fired out? Is it just simple thread lock? Looks to be on the thread brass piece as well.

[dyotat100]

The seal just pushes on the stem.  No loctite on the threads. Just put a new o ring on and tighten until it's bottoms out.

Best to put the seal on the stem when the brass is out of the valve. Then put a little silicone on the threads and o ring and screw the brass piece in. Also easier if you remove the brass spring retainer so the spring is not getting compressed when you screw in the front.