35 MECHANICAL PACKINGS MADE OF VARIOUS MATERIALS-NAMELY, [ LEATHER, METALS , ] FIBROUS MATERIALS, GRANULAR MATERIALS, RUBBER COMPOUNDS, SYNTHETIC RUBBER COMPOUNDS, PLASTICS AND VARIOUS COMBINATIONS THEREOF; GASKETS AND GASKET MATERIALS, INSULATION TAPES, TUBING, SHEETING [ , PUMP CUPS, VALVES, AND DISCS ]