well.. y did u choose to switch off ur phone.. remove ur door bell.. of course i wan to use finish up all the Co2 thats because there is plant in my tank.. are u telling me i should top up the tank and pass it back to u? thats more like a joke right..? simple enough now u also cant find the o ring right so how long more should i wait? wait till all my plants die off? then the Co2 tank is also standing beside my tank just like a vase. If u dun scam or cheat ppl then my pm wont have ppl pm me asking is it Anthony anot.. I repeat myself again i did not bring the Guage to my LFS its after i went back home to fix it on then i realist its leaking and i bring it bak to the LFS to do a checking.. And Whats wrong with knocking ppl door? even marigold can hire ppl to knocks ppls door to sell ice-cream. Anthony i'm still waiting for u to contact me since u choose to switch off ur phone. OH YA i did stand there and look at u changing the guage, but did u show me the o-ring? No right.. and u sold me a empty tank how am i going to know if its leaking or not. Ya refuse to refund me when on Sunday u agree to refund to me and yet on friday u change ur mind. So Funny.