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I usully use sizes 1-1/2, 1-1/4, and 1". All 10' long. One inside the other as push up pole. Drill a hole through the two smaller pipes 1' from the bottom of each and put a bolt through it so it sits on the larger pipe beneath it. Three of them is 28' tall. If I need more I use a 2" diameter pipe on the bottom. There is slack between 2" and 1-1/2" pipes so I wrap the 1-1/2" with some duct tape to reduce slop. With 4 pipes I get 37' height.