Air Venturi looking for help with air venturi avenger problems

Hello,

a few weeks ago I tried filling my air venturi avenger after not shooting it for a few months and it leaked at the front plug in the air reservoir. I thought it was some O-ring problem (took a few minutes going empty to about a 1000 psi and could hear air coming out.) As I already took the air reservoir off I changed the one at the back as well. They were both hard as rock so thought this would have fixed the problem, but it didn't. Now it doesn't leak anymore but whenever I try to fill it and press the pressure release button on the air tank instead of just one pop of air and the rifle being full, it now releases all the air from the rifle and can't take the female foster off before the rifle is completely empty.

I hope someone has some ideas about what the problem might be and how to solve it. (not sure if I worded everything right and if it's somewhat clear as to what the problem actually is as English isn't my native language.)
 
you need to pull the filler end cap of the top cylinder off, on the inside end of the end cap there is a valve spring retainer, remove retainer carefully, do not lose any parts when removing, there will be a spring, a ball bearing and an O-ring, replace the O-ring
size is CS 3/32, ID 1/8, OD 5/16, model B70104

or duro 90 B90104

metric 2.5x2.5 will be hard to find these are the SAE equivalent
 
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you need to pull the filler end cap of the top cylinder off, on the inside end of the end cap there is a valve spring retainer, remove retainer carefully, do not lose any parts when removing, there will be a spring, a ball bearing and an O-ring, replace the O-ring
size is CS 3/32, ID 1/8, OD 5/16, model B70104

or duro 90 B90104

metric 2.5x2.5 will be hard to find these are the SAE equivalent
Yes, I took it apart and got the spring and ball (plastic tho) but there was no o ring to be found. i don't know how it got lost but yeah. thank you for the links indeed hard to find the right kind of o-rings.
 
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