Pipes made of plastics, tubes made of plastics or fabrics, hose clamps; plastic or rubber valves for pumps, pump installations and pipes; plastic or rubber sliders; non-return, dosaging and relief-pressure valves of plastic or rubber material; oscillation and sound insulating devices, namely engine mounts capable of oscillation, sound absorbers in this class, plastic or rubber mufflers; plastic or rubber shaft couplings; all the foregoing being goods included in this class