Matthews Junior Pipe Clamp 429619 has a uniquely designed hook molded into the clamp which keeps the clamp on the pipe even with a light fixture attached while the bolt is being tightened. The Baby Pipe Clamp terminates in a 5/8 Pin with a safety chain and cotter pin attached. The Junior Pipe Clamp of course terminates in a Junior Receiver and also has a safety chain and cotter pin attached.
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