[Class : 17] Non Metallic Pipe Couplings; Non Metal Couplings For Use With Hoses; Non Metal Elbows For Rigid Pipes; Non Metal Fittings For Pipes; Non Metal Gaskets; Non Metal Hose Fittings; Non Metal Junctions For Pipes; Non Metal Pipe Connectors; Non Metal Pipe Couplings And Joints; Non Metal Pipe Fittings; Non Metal Pipe Jackets; Non Metal Pipe Joints; Non Metal Pipe Muffs; Non Metallic Connectors For Pipes; Non Metallic Couplings For Pipes[Class : 19] Non Metallic Rigid Pipes; Drain Pipes, Not Of Metal; Gutter Pipes, Not Of Metal; Penstock Pipes, Not Of Metal; Sewer Pipes, Not Of Metal; Water Pipes, Not Of Metal; Expansion Joints, Not Of Metal For Floors And Walls; Valves, Not Of Metal Or Plastic, For Water Pipes; Drain Traps [Valves], Not Of Metal Or Plastic; Non Metal Air Conditioning Ducts; Non Metal Beams; Non Metal Cornices; Non Metal Decking; Non Metal Down Spouts; Non Metal Downpipes; Non Metal Gratings; Non Metal Gutters; Non Metal Gutter Pipes; Non Metal Guard Rails; Non Metal Manhole Covers; Non Metal Posts; Non Metal Silos