We need to pressurise kegs but do we need co2? The main washer on my kingkeg is dead and I can't get one. I have had a bizarre idea. I have a football bladder and thought I'll cut it up but then thought why not sterilise it and inflate it in the barrel. I could inflate with air and save money on co2 and it would help form a seal. But I'm thinking order a standard tyre valve and replace s30 and have inflatable bladder as a permanent feature. Any thoughts. Would it taint the flavour?