Stainless Steel Design:Espresso coffee maker body through polishing design, smooth stainless steel material, three-ring precision thread, and pressure-tested safety valve to make your use process safer. Built-in safety relief valve to ensure that there will be no overpressure. It is corrosion resistant, rust resistant and easy to clean.(5pcs gasket seal ring: We have sent an extra rubber seal ring for each type of coffee pot. The gasket is expendable and can be replaced.