Rigid pipes, not of metal; water-pipe valves, not of metal or plastic

Pipe Clips; and Pipes and Fittings and Unions Therefor; All Made of Plastics Impervious to Acid

SANITARY AND LABORATORY FITTINGS OF PLASTIC, AND ACID-RESISTING FITTINGS OF PLASTIC, BUT NOT INCLUDING PIPES, FOR USE IN CONVEYANCE AND GENERAL PLUMBING