异径管也叫大小头，两端管口直径不同，用于连接不同直径的管子或法兰进行变径。
Different-diameter pipe size head, also called tube diameter at different, used to connect different diameter of pipe or flange diameter changes on.
异径管也叫大小头，两端管口直径不同，用于连接不同直径的管子或法兰进行变径。
Different-diameter pipe size head, also called tube diameter at different, used to connect different diameter of pipe or flange diameter changes on.
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