Re: Warped cast aluminum tank flange Home › Forum › Ask A Member › Warped cast aluminum tank flange › Re: Warped cast aluminum tank flange gofastgrampsUS Member - 2 YearsReplies: 54Topics: 25 March 9, 2018 at 3:39 am #72243 Louis don’t you think the tank might have a small leak with that large vent hole in the bottom. te. he.