Kral Puncher Breaker leaking after I try to install Huma relator

I just installed a Huma in one of my guns. I was getting leaks and also could not figure out why. In the end, I found it was an o-ring in the separating the plenum and the atmospheric breathing hole was missing. ( I don't know if it did not come with it, or I lost it without knowing it.) I went down to a local hardware store and found one that sort of fit, but it worked. Just an idea.
 
It woks now just cocking before I refill it and no sign of leaking yet and can’t wait to go shoot again with regulator on yayy, thanks all

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