Qalabka lo'du waa nooc ka mid ah deyrka lo'da ee tubada birta ah ee sifaynta xoolaha.Waxay ka samaysan tahay tuubooyinka oval iyo square.Sida daawaynta dusha sare, waa galvanized-kulul ka dibna dahaarka PVC.Farsamadan dahaarka gaarka ah ayaa ka dhigaysa mid ku wanaagsan ka-hortagga miridhku.