17 Couplings of rubber for tubes in the nature of non-metal pipe fittings; non-metal connectors for hoses in the nature of non-metal hose fittings; non-metallic couplings for tubes, namely, non-metal pipe fittings; non-metallic coupling sleeves for tubes, namely, sleeves of rubber for protecting parts of machine tubes; non-metal pipe joints, namely, non-metal elbow joints for flexible pipes; non-metal tubing connectors for fuel lines in the nature of non-metal seals for car pipe tube connections; fittings for rigid pipes, all non-metallic; non-metallic couplings for pipes; non-metal pipe couplings and joints; fittings, not of metal, for flexible pipes; pipe couplings of rubber; non-metal seals for flexible plastic pipe connections; non-metal pipe unions; junctions, not of metal, for flexible pipes; non-metal pipe fittings in the nature of non-metal junctions for pipes; fittings, not of metal, for rigid pipes