companion flange[kəm′pan·yən ‚flanj]
A pipe flange that can be bolted to a similar flange on another pipe.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
1.A pipe flange which has been drilled so that it will fit the standard drilled holes in a flanged pipe or fitting.
2. A pipe flange that is suitable for connection with a flanged valve or fitting.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.