SickJib_Brit Member Apr 4, 2011 #2 1.5" is what I get and works well.. Anything you can pretty much get your hands on should work, depending on if you want to put two side by side or just a single pipe. They come in all different dimensions.
1.5" is what I get and works well.. Anything you can pretty much get your hands on should work, depending on if you want to put two side by side or just a single pipe. They come in all different dimensions.