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Introducing the enhanced KnoxBox – Learn More about the New Buying Process!

KNOX COMPANY

1601 W. Deer Valley Road, Phoenix, AZ 85027


Main: 800-552-5669

Customer Service: 800-566-9269

Technical Support: 800-704-0889

Fax: 623-687-2290

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© Copyright 2026 Knox Company. All rights reserved. 
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    FDC Protection

     

    Fire Department Connections (FDCs) are the access points for firefighters to supplement additional water to a building's
    fire sprinkler system during a fire. Protect these vital protection systems with Knox locking FDC caps: FDC Locks and Storz Locks.

SECURE FIRE DEPARTMENT CONNECTIONS WITH KNOX FDC LOCKING CAPS

Compromised FDCs hinder response operations and increase potential risks to a structure’s occupants and firefighters. Working systems reduce heat, flames, and smoke while giving occupants valuable time to safely evacuate and minimize property damage. When systems fail during a fire outcomes can be devastating.

LOCKED FDCs KEEP SYSTEM OPERABLE

Uncapped FDCs jeopardize their performance during critical response operations.

FDC Locking Caps protect the connection and keep the system operable when needed by firefighters.

Fire department connections (FDC) are the access points where firefighters get supplemental water. Locking caps provide a strong and steady flow of water.

Commercial KnoxBoxes - KnoxVault 4400 Dual Lock Surface Mount and KnoxBox 3200 Recessed Mount

BENEFITS

Secure locking caps accessible by only authorized personnel

Knox-rugged design withstands all weather conditions

Knox FDC Locks: 2.5" and 1.5" NH sizes Knox Storz Locks: 4" and 5" sizes

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KNOX FDC LOCK

Knox FDC Lock® Benefits & Applications

Knox FDC Locks protect fire department connections - keeping systems clear of debris

to ensure the delivery of high-pressure water flow to fire sprinkler systems.

  • FDC Locks available in 2.5" and 1.5" NH sizes
  • Optional Swivel-Guard provides enhanced security
  • Eliminates costly services to back flush the pipes due to debris
  • Protects FDC swivel from theft, damage and vandalism
  • Ensures ready and reliable connections to fire sprinkler systems
  • Protects check valves from freezing in cold climate areas

APPLICATIONS

Fire Department Connections (FDCs) are your building's lifeline to fire prevention. When FDCs are left unsecured, they are vulnerable to damage, debris and vandalism which can constrict the flow of water to:


  • Fire sprinkler protection systems
  • Standpipes located in parking garages and stairwells
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KNOX STORZ LOCK®

Knox Storz Lock® Benefits & Applications

The Knox Storz Lock® protects large diameter Fire Department connections (FDC) from accidental damage, vandalism

and physical attack. Since the locking cap holds water pressure, it can be installed on hydrants.

BENEFITS

  • Knox Storz Lock available in 4" and 5" sizes
  • Eliminates costly services to back flush the system due to debris
  • Ensures FDCs' operational integrity
  • Keeps water connection clear of debris, animals, and vandalism
  • Provides a ready and reliable connection to sprinkler systems
  • Prevents water theft or loss in hydrant applications

APPLICATIONS

Fight fire with high-pressure water, every time. Knox Storz Lock cap protects large diameter FDCs from damage and vandalism on:


  • Fire hydrants
  • Standpipes
  • Fire sprinkler systems

WHICH FDC PRODUCT IS RIGHT FOR MY BUILDING?

RESOURCES

Knox FDC Protection Solutions Video thumbnail

Knox FDC Protection Solutions

FDC Locks Values, Myths and Implementation video thumbnail

FDC Locks Values, Myths and Implementation

 Protect Your Building from Fire Sprinkler and Standpipe System Failure

Building Fire Sprinkler System Protection

Knox Gate and Perimeter Access Brochure Thumbnail

Brochure

FDC Protection Solutions

FDC Case Study

Case Study

The “Weakest Link”

FDC Locks Spec Sheet Thumbnail

Spec Sheet

Knox FDC Locks

Knox FDC Storz Lock Spec Sheet Thumbnail

Spec Sheet

Knox Storz Lock

Knox Gate and Perimeter Access Brochure Thumbnail