The SIFCO Process Tank Silver Platers are primarily intended for silver plating steam valve seal rings, but they may also be used to silver plate other parts. Both tanks are made from chemical-resistant polypropylene. All other components are made of plastic, stainless steel, or plastic coated steel to minimize corrosion problems. The 57 liter unit also includes a pump to circulate solution and a 254 mm (10 in.) cartridge filter system.