***** let me save all the u.s. people the trouble and money... lol. I went and grabbed 1 1/2 inch pvc not thinking of outer diameter.. cut it, and it didn't fit. Went back and measured o.d. of 1 1/4 pvc with was under 1.5", came home, cut it... still didn't fit!! so the correct pic pipe is 1" works perfectly. 3d printed pieces fit together beautifully! I love it, does exactly what I needed!!! *****