上海川源水泵机械密封|密封圈|水封EA520-5/8 | EA520-3/4 |EA520-1 | EA560-25 | EA560-30 | EA560-32 | EA560-35 | EA560-1-1/2 | EA560-40 | EA560-2 | EA560-50 | EA560-5/8 | EA560-20 | EA560-45 碳化硅材质