This video tutorial demonstrates how to make a membrane pipe out of CPVC. The pipework is all 3/4" and 1/2" CPVC pipe and 3/4" CPVC adaptors (T-joint, coupling, cap). You can use 1/2" O.D. vinyl tubing for the mouthpiece, a piece of a Meijer grocery bag for the membrane, and some masking tape to create the bottom seal and to try to fix the pitch of some of the fingerholes. The pipe creates a very clear, clean sound that reminiscent of a clarinet or Scottish smallpipes. To get started building your own plastic membrane pipe, take a look!