The Sigma Electric Double Snap Lock 3/8 in. D Die-Cast Zinc Duplex Connector is crafted for dependable, fast, and code-compliant conduit connections in AC, MC, and FMC/RWFMC systems. With a compact 3/8" diameter and compatibility with a 1/2" knockout, this connector fits tight spaces while delivering a secure, vibration-resistant hold that electricians trust on demanding jobs.
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Die-cast zinc durability: a rugged, corrosion-resistant body built to withstand the bumps, heat, and wear of professional electrical installations.
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Double snap lock mechanism: two locking points engage quickly and firmly, providing a reliable grip without the need for extra tools or hardware.
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Wide conduit compatibility: designed for AC armor cable, MC cable, and FMC/RWFMC, streamlining multi-cable projects with a single, versatile connector.
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Precisely sized for tight spaces: 3/8" diameter fits common distribution runs while keeping a slim profile for crowded panels and boxes.
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Code-approved safety: UL Listed, CSA Listed, and ETL Listed—seal of safety and compliance for professional electrical work.
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Convenient packaging: sold as a single connector per bag, making it easy to stock and grab on the job site.
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Trusted branding: part of Sigma Electric’s Double Snap Lock line, designed to pair seamlessly with other Sigma Electric connectors and fittings.
This duplex connector is ideal for electricians, contractors, and skilled DIY installers who need a quick, secure solution for panel and junction-box assemblies, as well as run-through installations where space is at a premium. The double snap lock design accelerates installation, reduces the risk of loosening over time, and helps keep conduit securely in place even in vibration-prone environments.
Use cases and practical benefits
- Installing or upgrading AC, MC, or FMC/RWFMC conduits in panels, distribution boxes, and junction points where a reliable, compact connector is essential.
- Retrofits or new builds that demand fast, tool-free engagement without compromising safety or performance.
- Projects requiring adherence to UL, CSA, and ETL safety standards, ensuring installations meet current electrical codes.
- Applications with limited knock-out space thanks to the 1/2" knockout compatibility, enabling neater, more organized conduits in tight enclosures.
Installation tips
- Inspect the knockout edge and conduit for burrs; ensure clean, smooth surfaces before installation.
- Insert the conduit into the duplex connector until it seats fully against the internal stops.
- Press firmly to engage the double snap lock; you should feel and hear a decisive snap indicating a secure grip.
- Gently tug the conduit to verify the lock is seated and additional movement is resisted.
- Confirm compatibility with your specific AC, MC, or FMC/RWFMC cable type and comply with all applicable codes and listings.
Specifications at a glance
- Brand: Sigma Electric
- Sub-brand: Double Snap Lock
- Product Type: Duplex Connector
- Material: Die-Cast Zinc
- Conduit Compatibility: AC, MC, and FMC/RWFMC
- Diameter: 3/8"
- Knockout Size: 1/2"
- Packaging: Bagged, 1 piece
- Listings: UL Listed, CSA Listed, ETL Listed
For professionals who value efficiency without compromising safety, the Sigma Electric Double Snap Lock duplex connector delivers a secure, dependable connection that stands up to real-world installations. Its precise fit, versatile conduit compatibility, and trusted safety certifications make it a practical choice for modern electrical work—from panel-mounted conduits to compact junctions in space-conscious environments.
