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The BSC PREFERRED 26071 is a steel knockout seal designed to cover exposed knockout holes in steel outlet boxes and other metal electrical enclosures. When a knockout is removed during installation and then left unused, the open hole creates a code violation and a potential entry point for debris, pests, and moisture. This seal snaps or presses into the hole to restore the integrity of the enclosure. Electricians and electrical contractors install these seals as a standard step in finishing panel boxes, junction boxes, and outlet box rough-ins. This listing includes 4 seals per pack.
Knockout seals are used across residential and light commercial electrical work wherever steel outlet boxes, junction boxes, conduit bodies, or panel enclosures have unused half-inch knockout openings. Typical install scenarios include completing circuit panel rough-ins, closing off unused conduit entries in junction boxes, and satisfying inspection requirements for enclosure integrity. The half-inch size fits standard half-inch knockouts, which are among the most common found in residential and commercial steel boxes.
Designed as an OEM-style fit for standard half-inch knockout openings in steel outlet boxes and other metal electrical enclosures.
Installation is performed by a licensed electrician or qualified electrical contractor. De-energize the circuit and verify power is off at the panel before working inside any electrical enclosure. Press or tap the seal firmly into the knockout opening until it seats flush with the box wall. Installations must comply with applicable NEC requirements for enclosure protection and closure of unused openings.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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