Flexible pipes, flexible tubes, hoses and hose fittings, and fittings for rigid pipes, all non-metallic; nonmetallic couplings for pipes; non-metallic couplings for flexible pipes; non-metallic couplings for rigid pipes; non-metallic couplings for flexible tubes; fittings, nonmetallic, for flexible pipes; non-metal elbows for pipes; junctions, not of metal, for pipes; non-metallic insulated pipes; seals for pipes, namely, non-metal seals for plastic pipe connections; nonmetal seals for plasti...