PS na-eme ka mmanụ esiri ike pịa plọg mmanụ, ọla ọfụma, nke a na-enyocha n'ụzọ zuru ezu ma na-enyocha ya. A na-eji plọg mmanụ maka mgbochi nke nkesa mmanụ na sistemụ piping ebe anaghị eji ọkwa mmanụ.
