Sefuthumatsi sa screw plug ke karolo e nyane ea liheater tse qoelisoang, tseo hangata li hlokang sebaka se senyenyane ho sebetsa.Molao-motheo oa li-heaters tsa screw plug o tšoana le li-heaters tse nang le flanged.Mofuthu o qoelisoa leboteng la lisebelisoa, joalo ka likepe, litanka tsa metsi kapa lijana tsa lik'hemik'hale.