Stainless Steel 304/304L Pipe Fitting, Flange, Blind, Class 300, 2-1/2" Pipe Size Blind flange for covering or closing the end of a pipe in a piping system Bolt holes to connect to flat surfaces for easier installation and disassembly than welded flanges Made of stainless steel 304/304L for strength Low carbon content to ensure greater resistance to corrosion Meets standards ASTM A182, ASME SA182, and ANSI B16.5 for quality assurance