Seal Retainer Ring Valve Parts Machined directly from Round Bar ... PartsMachined directly from Round BarNC MachiningOil Coating and PhospateAlloy Steel or Carbon SteelRemove the sharp edgesConfims to ISO9001: ... the products as follows:1) Materials include: Stainless Steel, Carbon Steel, Alloy Steel, Ductile Iron, Grey Iron, Copper, Aluminum Bronze, ... ,BS, JIS, UNI, ANSI, ISO etc. Seal Retainer Ring