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  • Easily connect to BRK and Firex alarms without rewiring.
  • Convenient adapter plug saves time and installation costs.
  • Compatible BRK alarms: 4120-series, 9120-series, 7010-series, 5919, 2002RAC, SC6120B, SC9120B, HD6135FB, RM3.
  • Compatible Firex alarms: 406 (G-6), 4518 (ADC), 4618 (FADC), 484 (PG-40), 4480 (PAD), 5700 (ADH), 499.
  • Conforms to UL 1977 Standard

First Alert BRK/Firex Smoke Alarm Adapter Plug, 12-Pack Product Description

First Alert BRK/Firex Smoke Alarm Adapter Plug (12-Pack) - ADF-12

The First Alert BRK ADF-12 Smoke Alarm Adapter Plug is a specialized electrical accessory designed to simplify the process of upgrading and replacing outdated smoke detectors in residential and commercial properties. When homeowners or property managers decide to modernize their fire safety infrastructure, they frequently encounter the challenge of incompatible wiring harnesses left behind by older Firex systems. Traditionally, installing a new First Alert or BRK smoke alarm would require an electrician to cut the existing wires, strip the insulation, and manually rewire a new harness using wire nuts. The ADF-12 eliminates these labor-intensive and potentially dangerous steps by acting as a direct-connect bridge between the old Firex wiring and the new BRK or First Alert alarm unit. This plug-and-play solution ensures a secure, code-compliant connection in seconds, making it an essential tool for high-efficiency retrofitting.

This convenient twelve-pack is engineered for bulk applications, providing enough adapters to outfit an entire multi-level home or a small apartment complex. The ADF-12 is compatible with a vast array of legacy Firex models, specifically those utilizing the G6, G-18, or FADC series harnesses. This includes popular older models such as the Firex 4618, 4518, 4418, 484, 406, and the 5700 series. By utilizing these patented easy-adapter plugs, you can maintain the critical "interconnect" functionality of your home’s safety network. When alarms are interconnected, if one unit detects smoke in a basement, the signal is passed through the ADF-12 adapter to the rest of the house, triggering every alarm simultaneously. This "one-act-all-act" response is vital for providing early warning and maximizing evacuation time during a fast-moving fire emergency.

Safety and reliability are the foundations of the ADF-12 design. Each adapter is a UL-recognized component, conforming to the rigorous UL 1977 standard for electrical connectors. The high-quality plastic housing and precision-molded pins ensure a snug, vibration-resistant fit that prevents intermittent power loss or false alarms caused by loose connections. For professional contractors and DIY enthusiasts alike, the ADF-12 saves a significant amount of time spent on ladders and reduces the overall cost of a fire alarm upgrade project. By choosing these adapters, you are ensuring that your transition to the latest First Alert sensing technology—whether it be ionization, photoelectric, or dual-sensor—is as seamless as possible. Backed by the trusted reputation of BRK and First Alert, the ADF-12 represents a commitment to accessible, professional-grade safety for every household.

  • Instant Compatibility: Connects First Alert/BRK alarms to existing Firex wiring harnesses without tools.
  • Bulk 12-Pack Value: Perfect for whole-home upgrades, property management, and electrical contractors.
  • Interconnect Retention: Maintains the vital communication between alarms for whole-house alerts.
  • Broad Model Support: Works with Firex G6, G-18, FADC, 4618, 4518, 484, and 5700 series units.
  • UL Recognized Safety: Fully conforms to UL 1977 standards for electrical components and connectors.
  • No Rewiring Needed: Eliminates the need for wire nuts, stripping cables, or complex electrical work.
  • Reliable Connection: Precision-molded pins prevent power drops and nuisance alarm triggers.
  • Professional Finish: Provides a clean installation inside the electrical box without cluttered wiring.
Product Specs
UPC:
029054000040
MPN:
ADF-12
Category:
Smoke Alarms and Smoke Detectors
Product Manuals
First Alert BRK/Firex Smoke Alarm Adapter Plug, 12-Pack Video

If you are interested in ordering a large quantity of items you may qualify for volume pricing discounts. Volume Discount Pricing is a great way for customers to save big on large, bulk orders of most items available in our store. Please send a bulk order request to our friendly sales staff so they may create a quote and provide personal service for your order! You will receive a response within 1-2 business days and our office hours are Monday through Friday, 8am-5pm CST.

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ADF-12 customer reviews

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5 customers recommend this product
First Alert BRK/Firex Smoke Alarm Adapter Plug, 12-Pack Reviews
Kent Mous
May 6, 2026
Great

If you are looking to upgrade your home safety system without the headache of a major electrical project, the First Alert ADF-12 adapter plugs are an absolute must-have. I recently moved into a home with outdated Firex smoke detectors that hadn't been touched in nearly twenty years. I wanted to switch everything over to modern First Alert BRK units, but I was dreading the thought of cutting wires and crimping new connectors for twelve different mounting points.

Robert G
September 18, 2022
Verified Purchase
Super simple installation

Recently purchased a house where the previous owners didn't replace their smoke detectors for almost two decades. Still had original Firex equipment installed. This adapter saved at least an hour or two of rewiring for the 10 new First Alert smoke detectors

Michael D
August 5, 2022
Verified Purchase
You need this!

This made it so easy when I was switching from my old FireX smoke alarms to my new First Alret BRK smoke/Co2 alarms. Just plug and play!

CHA P.
September 2, 2019
Verified Purchase
Adapters

#1 adapters for interchange to first alert 120v products

Michael Savickas
February 6, 2017
Verified Purchase
Excellent Product

Excellent adapter, plus like the new look and confidence of my new smoke alarms.

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