利欧不锈钢卧式多级泵ECH4-60S ECHm4-60S ECHm4-60S内容：标牌 ECH4-60S内容：机械密封外观、机械密封内径外径测量 ECHm4-60S标牌 ECH4-60S机械密封 型号：CHL-16机械密封 改静环 静坏外径25左...