17 Plastic pipes, inspection well connection adapters for plastic pipes, plastic insertion sleeves for non-metal pipe connectors, plastic pipe connection sleeves, non-metal sealing rings for pipe connections, electrofusion plastic pipe welding collars predominantly of plastic, plastic pipe tapping saddles, plastic pipe elbows, plastic pipe tees, plastic pipe branching Y's, pipe reducing collars for plastic pipe, excentric transition fittings for plastic pipe, push fit pipe connectors for plastic pipe, plastic pipe spigot ends, plastic liners for metal or non-metal waste or sewer pipes, plastic liners for concrete catch basins, sewers and inspection wells