mag leaking out of the back, need help

[buckley16]

i am new to automags and just got a used classic and when i put a tank on it it leaks from the back of the vavle, can someone tell me how to fix this

[AGDlover]

ok while i still rember. take your valve, unscrew it, the little clear thick o-ring thing. take it and clean it off. if you don't have that little o-ring then put one on.

[i_baked_cookies]

turn down velocity