Na n'ezie ojiji ndapụta, iji mee ka igwe anaghị agba nchara ọkpọkọ oyiyi akwa (igwe anaghị agba nchara elbows, igwe anaghị agba nchara tees, igwe anaghị agba nchara nnukwu na obere isi, igwe anaghị agba nchara flanges, wdg) ọzọ mara mma na inogide, e nwere dị iche iche n'elu ọgwụgwọ. Ka anyị jiri ọgwụgwọ elu igwe anaghị agba nchara dịka ọmụmaatụ iji webata ụfọdụ usoro ọgwụgwọ elu.