Ebiwandiiko ebiragiddwa wansi byonna bikwata ku vvaalu y’okutambula kwa langi , ng’oyita mu biwandiiko bino ebikwatagana, osobola okufuna amawulire agakwatagana, ebiwandiiko ebikozesebwa, oba emitendera egy’omulembe ebikwata ku vvaalu y’okutambula kwa langi . Tusuubira nti amawulire gano gajja kukuwa obuyambi bwe weetaaga. Era singa ebiwandiiko bino eby’okutambula kw’amazzi mu langi (paint circulation valve articles) tebisobola kugonjoola byetaago byo, osobola okututuukirira okufuna amawulire agakwatagana.