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Hi my name is ***** ***** I have been in the plumbing field for 20 years. I will be glad to help you today. The part that you are talking about is actually made of brass. It is cut with a hack saw to the length necessary before installing the spout. There is no way to extend it and raising it will take some work. It would require removing it and repiping it to raise it to the desired height. Are you able to solder and do you have access to the piping on the bottom of the deck of the tub?