I used 2in PVC and T's. Just cut a piece of PVC to go between each T about 3 inches long. Once you have the 3 T's pushed together set the open ends on some thing flat where they are lined up then place one in on something firm and tap on the other end to seat. You can then if you want wipe some glue around the outside of the coupling. Then cut 3 sections of pipe the length you want and insert them. I mounted mine by placing the T section on the floor and used 2 in plastic pipe clips around each standup to the side of my boat with self tapping screws.
Proud Member of Team Geezer
Charlie Weaver USN/ENC 1965-1979