Non-metal stuffing rings being O-rings; non-metal sealing rings for use as connection seals for hose fittings; articles made of rubber for sealing, namely, rings of rubber for use as pipe connection seals, sealing plugs made primarily from rubber; seals, not of metal, for joints; seals, not of metal, for conduits; water-tight collars of rubber in the nature of rings of rubber for use as pipe connection seals; flexible hoses, not of metal; fittings, not of metal, for flexible pipes; couplings,...