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I am redoing my 15' and recently removed all of the drain tubes. it took abot 15 minutes to do this. I used a 1" galvanized pipe, a rubber mallet and a pair of vice grips. I bent the outside flaired end othe draintube so that it would catch the edge of the pipe. i then started driving the pipe through the drain tube opening hence driving the tube out the other end. periodically I would spin the pipe to keep it from bindingonce the pipe was through the old tube was out. I then put the vice grips on the end of the pipe and tapped on it to back the pipe back out.