鑄鐵(tie)排水管W型配(pei)件(jian)旋(xuan)流三通(tong)(tong)(tong)采(cai)用(yong)順水三通(tong)(tong)(tong)或順水四(si)通(tong)(tong)(tong)和(he)45°斜(xie)通(tong)(tong)(tong)或45°斜(xie)四(si)通(tong)(tong)(tong)”,現在還有旋(xuan)流三通(tong)(tong)(tong)和(he)旋(xuan)流四(si)通(tong)(tong)(tong),排水和(he)通(tong)(tong)(tong)氣效果比(bi)順水、比(bi)45°斜(xie)要好上面(mian)的管件(jian)有了變(bian)化,下面(mian)的管件(jian)也(ye)有變(bian)化 。