Babban bututun ƙarfe yana nufin bututun ƙarfe tare da babban adadin kwararar jirgin sama.Wannan nau’in bututun gabaɗaya yana buƙatar ƙirar tsari na musamman, kamar cikakken bututun mazugi, wanda ke buƙatar tsari na keɓaɓɓen ruwa na ruwa don cika yanayin.

Don ƙera manyan bututun ƙarfe, mun sayi babban famfon ruwa na musamman. Kansa zai iya kaiwa mita 50 kuma adadin kwararar zai iya kaiwa mita mita 800 a cikin awa daya, wanda zai iya cika yanayin gwajin yawancin nozzles.