Bututun tushen iska shine samar da tushen iska don kayan aikin pneumatic. Babban bututun iskar gas gabaɗaya ana yin shi ne da bututun ƙarfe na carbon, bututun bakin ƙarfe ko bututun galvanized, yayin da mafi yawan bututun iskar gas ɗin reshe an yi shi ne da bututun galvanized.
Bututun siginar huhu shine watsa siginonin huhu, gabaɗaya tare da farin bututun ƙarfe, bututun jan ƙarfe ko bututun nailan.
