Isuku ihagaritse isafuriya ikozwe mubice byiza-birebire hamwe nicyuma kitagira iherezo, biramba kandi bifite umutekano. Prortical pompe ifite igitutu kinini numutwe muremure, utezimbere cyane imikorere ya sisitemu yo kurinda umuriro. Kandi portical pompe yahagaritswe cyane muri sisitemu yo kurinda umuriro, gutunganya amazi, kuhira, nibindi.