2 ” pipe flange with 4 holes is a protruding rim or collar on a pipe that is used to connect pipes, valves, and other equipment in a piping system. The flange has a 2 ” nominal pipe size and features four holes for securing it to another flange or surface using bolts. These flanges are commonly used in plumbing, industrial, and mechanical applications to create secure and leak-resistant connections between pipes or fittings. They are usually welded or screwed onto the end of a pipe and serve as an attachment point for other components.