An tsara masu dumama dumama sama da gefe don shigarwa a saman tanki tare da ɓangaren mai zafi da aka nutsar da kai tsaye tare da gefe ko a ƙasa.Wannan yana ba da sauƙi cire dumama da yalwar sarari aiki a cikin tanki.
A kan gefen nutsewar dumama an tsara musamman don sanya su a cikin babban ɓangaren tankuna.Abubuwan da za a yi zafi ko dai a ƙarƙashin injin tankin masana'antu ko kuma a gefe ɗaya, saboda haka sunan.Babban fa'idodin wannan hanya shine cewa an bar sarari mai yawa a cikin tanki don sauran ayyukan da za a yi kuma ana iya cire mai zafi cikin sauƙi lokacin da aka sami zafin da ake buƙata a cikin abun.Abubuwan dumama na injin da ke kan tsarin aikin gefe yawanci ana yin su ne daga karfe, jan ƙarfe, simintin ƙarfe da titanium.Za a iya samar da murfin fluoropolymer ko quartz don kariya.
An tsara na'urori masu zafi a kan gefen-gefe don shigarwa a saman tanki tare da yanki mai zafi da aka nutsar da kai tsaye tare da gefe ko a kasa.Suna ɗaukar sarari kaɗan, suna kawar da buƙatar shigar da tanki, ana cire su cikin sauƙi don sabis, kuma suna samar da isasshen sarari a cikin tanki.Abubuwan da aka tsara na al'ada daidai gwargwado suna rarraba zafi ta hanyar tuntuɓar kai tsaye a aikace-aikace da yawa, gami da maganin acid da alkali.
Masu dumama sama-da-gefe sun dace don dumama ruwa, mai, kaushi, gishiri da acid.Ana haɓaka juzu'in aikace-aikacen hita sama da gefe tare da kayan kwasfa na zaɓi, ƙimar kilowatt, shingen tasha da hanyoyin hawa.