JDG, yewweḍ i "Junction Duct Galvanized," d yiwen n ufid n ufid n tmeɣli ay yesseqdac s mliḥ deg kra n usellamawin n tesnasin, asagi deg tfernu n tmeacint n tmeɣra. Aql-nnes tamezwarut nettat ad tbedded tkatertin yernu ad tḥeqqel tnaɣen ur t-id-yettqef ara gar yisemmacint yemgerḍen n tmacinti. Ɣef-d tnefhmeṛ n JDG yesɛa i yimanen deg temlilit-a.