hi i have brewed beers and ales before but years ago untill my keg burst and drown my kitchen so i gave it up. but recently i have been given 2 kegs (used but in good condition) the problem i have they are not the kind of kegs i am used to they dont have co2 injectors valves on them but some rubber. i think its a pressure relief valve. my main question is what can i brew in these? and does anyone have any idea what a good kit to get would be for someone just trying to get back into brewing. thanks !