Rubber knockouts insulate bushings for knockout openings and snap in to knockout openings on boxes in dropped ceilings or interior walls. This allows low voltage wires and cables to be run to devices inside boxes or enclosures. They have a smooth surface that protects wires from the sharp edges on boxes or enclosures.

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Cooper 76BOX
Cooper 76BOX
3/8 Inch Rubber Bushing For Knockout Size .375 Inch
Cooper 77
Cooper 77
1/2 Inch Rubber Bushing For Knockout Size .50 Inch (7/8")
Price: $109.80 c
Price: $147.60 c    
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