Isetyenziselwa ukuphelisa okanye ukwahlula iinkqubo zemibhobho, iiflange ezingaboniyo ziidiski ezingenanto.Xa ifakwe ngokufanelekileyo kwaye idibaniswe ne-gaskets echanekileyo, banokufikelela isitywina esibalaseleyo esilula ukususa xa kuyimfuneko.