订购时，请指定链轮齿和‘链条编号或美国尼伯科阀门型号和通径。
When ordering specify either the sprocket and chain number or the NIBCO valve figure number and size.
订购时，请指定链轮齿和链条编号或美国尼伯科阀门型号和通径。
When ordering, specify the sprocket number, chain number and length, or the NIBCO valve figure number, size and the chain length.
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