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Universal Smoke Detector Box Adapter Plate
A 130 mm ceiling adapter ring, 6 mm thick, for fitting a new smoke or CO detector to an old electrical box. The counterbored box slots sit on a diameter and run from 66 to 94 mm hole spacing, which covers 3 in round, single-gang (83 mm) and 4 in octagon (89 mm) boxes. Four radial M4 slots for the detector have a captive-nut track underneath and reach 64–116 mm screw spacing, and a 50 mm hole in the middle lets the wiring through.
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