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If it's in bad shape, it'll all but fall out. First, bend the flare on one end back in so it's smaller than the tube diameter and give a pull at the other end with a pair of pliers. If not, you want to try and push or bend the outer section of the tube in towards the middle. Start at say 3 o'clock position with a screwdriver, and push the outer edge in towards the middle. Try and work your way down the outside length of the tube towards the other end, staying at the 3 o'clock position. You have to be careful not to hit the hull. Once you get it bent in from one end to the other, the overall diameter will decrease and it should pull right out.