Type 6 swivels ( Stub-e-DUB™) are especially designed to fit inside custom built reamers. There are several manufacturers making these special reamers. They have a mounting flange allowing assembly into the reamer and thereby reducing the gap back to the utility being installed. The flange has jacking screws as well as a plugged water port. These swivels are totally self contained and greaseable, please apply to Customer Service for mounting specifications.