Manufacture of O-rings in dimensions and materials both in dimensions according to standards and adapted to special casings, in usual or not materials such as high hardness and low friction Polyurethane, EPDM FDA, Viton (R) ED, and FDA, NBR FDA, EPDM cured with peroxide, EPDM with KTW approval for drinking water, virgin PTFE or with carbon, bronze, fibreglass, PEEK or Ekonol additives.