Original poster: "Daniel Kline" <daniel_kline-at-med.unc.edu> All, I was thinking about bending PVC tubing into a toroidal shape for covering with aluminum tape and ran across this site. I'm not sure if the elbows would work, but I'm thinking the sweeps might? They go up to 6" in a variety of radii. Dan K. http://www.pvc-conduitfittings-dot-com/