Flange to 2″ / 51mm ID pipe. Pipe ID: 51±0.8mm. Pipe OD: 54±0.8mm. OAL: 5.91″ / 150mm. Tight Connection: Each flange hole is CNC precision machined to enable an exact fit to the pipe. Utilize gaskets between the two flange faces to make it tight by creating a sealed interface and prevent leaks.