Bushings are available in a variety of models and designs. The purpose of the bushings is to seal between two or more surfaces and is very much a type of packer, but with the difference that injection is not always carried out.
With its own tool manufacturing, GMA can easily produce customized bushings. A bushing does not have to be round or have a smooth outside/inside, but pictures show a bushing with both internal and external threads, the bushing can be made square/rectangular (or as a hexagon/octagon).
Your needs guide us, contact us and we can investigate whether we can manufacture exactly the fitting you need.