Izifudumezi zokucwilisa ze-screw plug zilungele ukushisisa ukucwiliswa okuqondile koketshezi, okuhlanganisa zonke izinhlobo zamafutha nezisombululo zokudlulisa ukushisa.Izici zokushisa ziyi-hairpin egobile futhi ingaba eshiselwe noma i-brazed kupulaki yesikulufu, kuye ngokuthi i-element sheath kanye nokuhambisana kwezinto zepulaki.Amatheminali enhloso evamile ajwayelekile futhi anokumelana nomswakama ngokuzithandela, ukumelana nokuqhuma kanye nezivalo ezimelana nokuqhuma/umswakama ezitholakalayo ukuze zihlangabezane nezidingo ezithile zohlelo.Ama-thermostat angakhethwa ahlinzeka ngokulawula izinga lokushisa kwenqubo elula ku-screw plug yokucwilisa heater.