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Kral puncher jumbo orings needed

So I’m looking for orings for the quick attach fitting for the Kral puncher jumbo. I lost the orings doing somthing I probably shouldn’t of been doing but I had not thought it through. I have been considering another air rifle that takes 4500psi. So I have been wondering what it would be like to hand pump to 4500 with my hill pump. So with it not connected to anything is closed the bleeder and pumped it to 4500. And right before I got to 4500 The orings decided it was done. I tried some orings I had in my oring kit but I’m guessing that are imperial not metric because thy popped right away. Thanks guys - JT