17 WASHERS OF RUBBER FOR USE IN MACHINES, AUTOMOBILES, SHIPS, CYLINDERS AND TOYS; NON-METAL SEALS FOR USE IN MACHINES, AUTOMOBILES, SHIPS, CYLINDERS AND TOYS; RINGS OF RUBBER FOR USE AS PIPE CONNECTION SEALS; SEALS FOR WATER PIPE CONNECTIONS;SEALS FOR PLUMBING PIPE CONNECTIONS; NON-METAL GASKETS FOR USE IN MACHINES, AUTOMOBILES, SHIPS, CYLINDERS AND TOYS; PIPE GASKETS; WATERTIGHT RINGS FOR PLUMBING PIPES