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The HALEX/SCOTT FETZER 20421 is a 1/2 inch squeeze-style connector designed to secure armored cable (AC) and flexible metallic conduit (FMC) to electrical enclosures, junction boxes, and panels. Each connector is constructed from die cast zinc for durability and solid mechanical connection. The squeeze design allows quick, tool-minimal installation without threading or set screws. This listing includes a pack of three connectors, making it a practical choice for jobs requiring multiple terminations. It is typically installed by licensed electricians during new construction, renovation, or service panel work wherever AC or FMC enters a metallic enclosure.
The 20421 connector is suited for residential and light commercial electrical work. The 1/2 inch trade size fits standard armored cable and flexible metallic conduit of the same trade diameter. Electricians commonly use these connectors at panel knockouts, junction boxes, and device enclosures. The polybagged 3-pack format is well suited for service vans and smaller job sites where a modest quantity of connectors is needed without bulk packaging.
Designed as an OEM-style replacement and standard-fit connector for 1/2 inch armored cable and flexible metallic conduit terminations at metallic electrical enclosures.
Installation is performed by a licensed electrician in accordance with NEC Article 320 (armored cable) or Article 348 (flexible metallic conduit) as applicable. De-energize the circuit and verify absence of voltage before opening any enclosure. Insert the conduit or cable into the connector body until it seats fully, then squeeze the connector into the knockout opening to lock it in place. Inspect the connection for secure mechanical hold before restoring power.
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