三(san)(san)通(tong)(tong)(tong)為管(guan)(guan)(guan)(guan)(guan)件(jian)(jian)、管(guan)(guan)(guan)(guan)(guan)道連(lian)接件(jian)(jian)。又(you)叫管(guan)(guan)(guan)(guan)(guan)件(jian)(jian)三(san)(san)通(tong)(tong)(tong)或者三(san)(san)通(tong)(tong)(tong)管(guan)(guan)(guan)(guan)(guan)件(jian)(jian)， 三(san)(san)通(tong)(tong)(tong)接頭，用在主管(guan)(guan)(guan)(guan)(guan)道要分支管(guan)(guan)(guan)(guan)(guan)處。 三(san)(san)通(tong)(tong)(tong)是具有三(san)(san)個(ge)(ge)口子，即一個(ge)(ge)進口，兩個(ge)(ge)出(chu)口；或兩個(ge)(ge)進口，一個(ge)(ge)出(chu)口的一種(zhong)化工(gong)管(guan)(guan)(guan)(guan)(guan)件(jian)(jian)，有T形(xing)與Y形(xing)