650715C * 6-1/16″ EIA to 4-1/16″ Flange Step Reducer, No Accessories

650715C * 6-1/16″ EIA to 4-1/16″ Flange Step Reducer, No Accessories

650150A * 6-1/8″ EIA to 1-5/8″ EIA Step Reducer, w/ 6-1/8″ Inner Connector, Anchor Insulator, Hardware Kit & O-Ring

650715D * 6-1/16″ EIA to 4-1/16″ Flange Step Reducer, w/ 4-1/16″ Hardware Kit & O-Ring