Are link seals watertight? Link seal is used to permanently seal any object that is passing through any wall or floor. It is a mechanical seal installed on pipelines. The pipeline may be made of steel, metal, plastic, or concrete. The pipeline may be carrying gas, oil, or water. A link seal is a form of a belt and has interconnecting links. It also has bolts and pressure plates. These links are used to create a watertight seal between the main carrier pipeline and the hole in the wall or floor. This helps to seal the annular space. The belt is wrapped around the pipeline and the same is later pushed into the empty space between the pipeline and the hole. https://www.raci.tech/