We're currently trying to figure out what a pipe coming out of the floor of our 1905 house. We are located in Ottawa, Ontario, Canada. The pipe is about an inch in diameter and capped. The cap has a 'G' on it. It looks very old, as there is significant corrosion on it. I can't get it open without heating it, and I haven't yet tried that. I thought it might be the pipe leading to an undeground oil resevoir, but I don't think this is the case for two reasons. First, it is very rare that oil resevoirs would be underground in such an old house. Second, I already can see where the oil line ran from outside the house to the inside. If anyone had any guesses on what this might be, or just a general direction, I'd be very grateful.