Knox Standpipe Lock 2 1/2" NH/NST Female Locking Cap
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of
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Regular price
Price:
$625.00
Regular price
Sale price
$625.00
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per
Stock Level: 10 or more
Product Status: In Stock
When Will it Ship:
Shipping Cost: Free on orders over $100
Shipping Transit Time: 2 to 5 Business Days
Eligible for Express Shipping: Yes
Stock Level Updated: Mar 18, 2026
Item Number: KX4011
Weight: 7.0 lb
Couldn't load pickup availability
- Size: 2 1/2 inch
- Threads: NH
- Material: Stainless steel to resist against physical attack
- 3.068 X 7 1/2 TPI but can be customized to fit any 2 1/2” thread pattern
- Water-tight
- Brass threads to assist in ease of installation
- Lock: Locks with a proprietary Knox FDC Wrench
- Authorized by 2018 IFC and IBC (Chapter 905.11)
- P/N: 4043 (mfr’s cat. ID)

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Description
The Knox Standpipe Lock protects standpipes, fire and wall hydrants from accidental damage, vandalism, and physical attack. Since the Knox Standpipe Lock holds water pressure, it can be installed on hydrants. The Knox Standpipe Lock is available for 2.5” connections with varying thread options and is operated with a Knox FDC Wrench controlled by the Fire Department.
- Protects dry and wet standpipe outlets in stairwells from vandalism
- Reduces unauthorized cap removal and cap theft
- Assures uncompromised threads
- Discourages water theft
- Can be mounted onto fire hydrants
Applications
- Wet and dry standpipes
- Fire hydrants
- Wall hydrants
Warning
This product must be installed by Authorized Fire Department representative or Fire Department-Authorized Contractor only. This is a security product that requires a special fire department keywrench to lock the cap in place. Unauthorized installation may result in improper locking of the cap. An improperly locked cap may be subject to removal by unauthorized personnel.
About Knox Company
Over forty years ago, a unique concept in rapid access for emergency response was born. The KnoxBox®, a high-security key lock box, was designed to provide rapid access for emergency responders to reduce response times and protect property from forced entry.
Today, one revolutionary lock box has grown into a complete system providing rapid access for public safety agencies, industries, military, and property owners across the world. The Knox Company is trusted by over 14,000 fire departments, law enforcement agencies, and governmental entities.