[Class : 6] Pipes And Tubes And Parts And Fittings For Pipes And Tubes Made Wholly Or Principally Of Metal; Pipes And Tubes And Parts And Fittings For Pipes And Tubes, Principally Made Of Impermeable Metallic Barrier Layer Which Is Incorporated Between Plastic Layers.[Class : 11] Apparatus For Water Supply And Sanitary Purposes; Parts And Fittings Therefor Included In This Class.[Class : 17] Pipes And Tubes And Parts And Parts And Fittings For Pipes And Tubes, All Made Wholly Or Principally Of Plastics Or Plastics Reinforced With Glass; Pipes And Tubes And Parts And Fittings For Pipes And Tubes, Principally Made Of Multi Layered Plastics Incorporating An Impermeable Metallic Barrier Layer; Couplers, Couplings, Spigot Fittings, Backing Rings, Gaskets, Electrofusion Fittings, Tapping Saddles, Reducers, Tees, Branching Saddles, Elbows, "Y" Pieces, Wall Brackets, Pipe Clips, Flanged Branch Tees, End Caps, Stud Flanges And Sockets, All For Electrofusion And Butt Fusion, Not Of Metal; Plastics And Glass Reinforced Plastics In The Form Of Sheets, Panels And Shaped Sections.