Cov yeeb nkab haum yog ib qho khoom siv uas txuas cov yeeb nkab rau hauv cov yeeb nkab. Raws li txoj kev sib txuas, nws tuaj yeem muab faib ua plaub hom: lub qhov (socket) yeeb nkab haum, threaded yeeb nkab haum, flanged yeeb nkab haum thiab welded yeeb nkab haum. Lub luj tshib yog siv rau cov yeeb nkab tig; lub flange yog siv los ua cov yeeb nkab Cov khoom txuas nrog cov yeeb nkab txuas nrog cov yeeb nkab kawg, cov yeeb nkab tee yog siv rau qhov chaw uas peb cov yeeb nkab tau sau, plaub-txoj yeeb nkab (hla yeeb nkab) yog siv rau qhov chaw. qhov twg plaub cov kav dej tau sau, thiab cov yeeb nkab reducer yog siv rau kev sib txuas ntawm ob lub kav dej ntawm cov yeeb nkab sib txawv.