17 Non-metal pipe system components for use in transporting fluids, namely, closet adapters, air eliminators, caps, clamps, couplings, crosses, crossovers, drains, eccentric couplings, elbows, elbow adapters, expansion tanks, fasteners, floor flanges, flexible nipples and cutoff nipples, manifolds, panels, plastic pipes for plumbing, reducers, return bends, spacers, specialty connections, supports, tees, and tubing