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Electrical - Conduit Clamp 1in

Conduit Clamp 1in 

http://www.homedepot.com/p/Carlon-1-in-PVC-Conduit-Clamp-Case-of-12-5-Packs-E977FC-CTN/202208869     $18.72 for 60 (31 cents)

 

Lowes does them in 5 packs for about 26 cents per clamp (but it's not on their web site).

 

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