This photo shows some things that you will need. Clockwise from left to right are a T-joint coupling, a tape measure ruler, an X-joint coupling, and a L-joint coupling. I used ¾ inch plastic PVC pipe, so the couplings are for this size piping. All the joints have 90 degree angles, which makes a triangular shape tough to construct. The T-joint and the L-joint couplings are cheap, about 30¢ apiece if bought separately, or less than 20¢ apiece if bought in bags of ten or twelve. The X-joint coupling was more expensive at over a dollar apiece. I guess plumbers don’t have much need for such a joint. The most valuable tool is a tape measure ruler. You need to measure everything before making any cuts.