Plates or angles fitted closely around or against continuous members passing through a water tight or oil tight member and caulked or welded to maintain the water or oil tightness of the structure.
Amacwecwe okanye iikona ezakhiwe kufutshane okanye chaseneyo nokunye okumana kugqitha ekuqinisweni kwamanzi okanye ukuqiniswa kwe-oyile nentambo engaphothwanga okanye eyenziwe ukuba igcine amanzi okanye ukuqiniswa kwesakhiwo nge-oyile.