IngoziAbanini zithuthi banokuziva bekhuselekile esazi ukuba izikhongozelo zetanki ze-ISO zivunywa kwihlabathi liphela kwaye zinengqiqweni esemgangathweni esemgangathweni.Ukuguquguquka okukhulu kwendalo
Kuxhomekeka kuhlobo lwempahla, izikhumba ezahlukeneyo zinokuqeshwa. Isikhongozeli sibonisa i-manhole ngaphezulu, ubuncinci ivalve enye, kunye nenye ivalve ezantsi. Zimile njengezilinda.
