[MrForbes]

They make 1.5" ABS sewer pipe too, it's lighter and tougher than PVC, and looks so cool since it's black. We're currently planning our arm to be made of 1.5" ABS at the manipulator end, and 2" ABS at the arm pivot end...it'll do an "extendo" maneuver at the beginning of the match to become a longer arm. If it all works, that is. The prototype is assembled, but not yet powered or mounted to a robot.