Zomangira zopanda madzi za O-ring self-sealing screws ndi zomangira zatsopano zomwe zimapangidwira kuti zizitha kusindikiza bwino pamapulogalamu omwe amafunikira kuti zisalowe madzi, osalowa mpweya, komanso osamva mafuta. Zomangira izi zimakhala ndi mphete ya O-ring yomwe imapanga chisindikizo chodalirika, kuteteza kulowa kwa madzi, mpweya, ndi mafuta. Monga otsogola opanga zomangira zapamwamba kwambiri, timapereka zomangira zodzitchinjiriza zopanda madzi za O-ring zomwe zimakwaniritsa zofunikira zamakampani osiyanasiyana.