Simple thermostat wall trim plates
thingiverse
The design is quite straightforward; it's intended for use with a double box setup where a single adaptor plate is used to attach either a thermostat or something similar. This particular cover plate slips over and stays in place without the need for screws, making it unsuitable for standard wall switch or outlet installations. However, you could potentially utilize this under a standard plate if there's been damage to the surrounding area of the box and extra coverage is needed to conceal any defects.
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