Rigid plastic pipes for construction; Drain pipes, not of metal; Aluminum-plastic composite pipes composed primarily of plastic for construction purposes; branch pipes, not of metal; water pipes, not of metal; rainwater pipes, not of metal; non-metallic building materials, namely, PEX pipe flexible water Tubing for plumbing, PEX pipe flexible water Tubing for heating, PERT pipe flexible water Tubing for heating, PEX pipe bend support; non-metallic pipes for ventilation and air conditioning eq...