...but just save yourself some hassle and get a proper set of O-rings and a nice aluminum tank.
Do you know where people can get new o-rings without buying one of the new aluminum tanks? I have 2 VVNs (neither of them leak, but having extra o-rings on hand sounds like a good idea) and I got a new copper colored aluminum tank from AquaVapor a few weeks ago, but it didn't come with new rings...