Knox FDC Protection Program

Fire Service


The Knox® FDC Protection Program is a complete system that provides protection for both the intake and discharge sides of water based fire protection systems from accidental damage, vandalism and physical attack. This high quality system provides fire department control over FDC equipment at no cost to your department.

The locking Knox® FDC plug was developed to protect fire sprinkler connections from accidental damage, vandalism and physical attack. Installation of a locking FDC cap ensures sprinkler reliability and building safety by preventing foreign objects from entering the sprinkler system.

The Knox FDC locking plug is available in a 1.5 and 2.5 inch stainless steel male plug available in National Standard Thread and several other thread sizes and diameters. For female threads, a 2.5 inch SecureCap is available. Locking 4 inch and 5 inch StorzGuard caps made of hard-anodized aluminum are also available.

The locking caps and plugs are easily and quickly removed during an emergency with a Knox Keywrench. The Keywrench engages a lock on the product that is exclusive to the fire service nationwide. Keywrenches are controlled by each fire department that authorizes the program in their jurisdiction.

International Fire and Building Code

Language in the 2012 International Fire Code, 2009 International Building Code and 2012 NFPA 1, Fire Code all authorize the installation of locking caps in your jurisdiction. The codes read as follows:

2012 International Fire Code Chapter 912.3.1

2012 International Building Code Chapter 912.3.1

"Locking Fire Department Connection Caps: The fire code official is authorized to require locking caps on fire department connections for water-based fire protection systems where the responding fire department carries appropriate keywrenches for removal."

2012 NFPA 1, Fire Code Chapter 13.1.12

"The AHJ shall have the authority to require locking fire department connection (FDC) plugs or caps on all water-based fire protection systems."