The document discusses a Knox FDC plug, which is an optional cap that fits over a fire department connection (FDC) to prevent tampering. The plug is secured by inserting a Knox keywrench into the plug and turning it to widen the threads and hold it in place. To remove the plug, the keywrench is inserted and turned in the opposite direction to shrink the threads, or it can be physically unscrewed using the studs on the plug. The plug provides peace of mind for business owners and firefighters that the FDC has not been tampered with.

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7. Knox FDC Plug Training