414 We usually use elbow (bend, flange, tee, reducer ) as a kind of pipe fitting.
414 We usually use elbow (bend, flange, tee, reducer ) as a kind of pipe fitting.
我们常用弯头（弯管、法兰、三通、大小关）作为一种管件。
414 We usually use elbow (bend, flange, tee, reducer ) as a kind of pipe fitting.
我们常用弯头（弯管、法兰、三通、大小关）作为一种管件。