应当定期检查管钳，更换已磨损或有伤痕的钳牙及牙床。
Pipe wrenches should be inspected regularly. Replace the heel and jaw section if found to be defective or worn out.
管扳手，管钳：有两个锯齿形的钳牙，一个可调节以抓起或扳动管道。
A wrench with two serrated jaws, one adjustable, for gripping and turning pipe.
管扳手，管钳：有两个锯齿形的钳牙，一个可调节以抓起或扳动管道。
A wrench with two serrated jaws, one adjustable, for gripping and turning pipe.
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