Cylinder joinings; Gaskets for use as a fluid tight seal; Metric O-ring kits comprised of non-metal O-rings of various sizes for use as connection seals; Non-metal sealing rings for use as connection seals; Non-metal seals for PVC pipe connections; Oil seals; Oil seals for sorting machines and packaging machines; Oil seals, not of metal; Sealing and insulating materials; Sealing plugs made primarily from rubber