... gaskets Surface Treatment:Galvanized,Bright,Black-coated. Standard:Chinese,America,Germanic and Japanese Standard gasketsPad in connection with the nut between ... nuts on the connector pressure.Standard Gaskets:Surface Treatment :Galvanized ,Black-coated,Bright.Standard:Chinese,America,Germanic,Japanese StandardPeculiar ... gaskets,of which surface treatment the same with standard gasket. Flat Gaskets