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The NSI 9891 is a plastic knockout plug used to cap unused knockout holes in a box or enclosure. Its low-cost, strong, lightweight plastic body provides excellent abrasion and wear resistance and lowers friction. All Bridgeport fittings meet OSHA-recognized NRTL-listed electrical standards.
The NSI 9891 knockout plug is made of plastic and is 1/2 inch in size. It is used to cap unused knockout holes in a box or enclosure.
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