Umugozi wumuringa wibikoresho bikozwe mumuringa bikozwe mumashanyarazi umwe cyangwa abiri akomeye cyangwa umuringa woroshye, hamwe na PVC cyangwa XLPE, umuyoboro winyuma ugizwe ninsinga nyinshi zumuringa zoroshye zomekeranye mumashanyarazi yumuzingi wumukara ushobora gukorwa na PVC, polyethylene ya termoplastique. cyangwa XLPE.