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VK4921 - Standard Response Concealed Pendent Sprinkler (K5.6)

VK4921 - Standard Response Concealed Pendent Sprinkler (K5.6)

Viking Standard Response Concealed Pendent Sprinkler VK4921 is a thermosensitive glass-bulb spray sprinkler designed for installation on concealed pipe systems where the appearance of a smooth ceiling is desired.

The addition of a reinforced nylon wrench allows for installation with the protective cap in place, minimizing the chance of damage to the sprinkler during installation. Viking also offers a cap removal tool to aid in finishing the job from the ground. 

Technical Details

K Factor: 






Part Number: 


VK Number: 


Additional Information: 

NOTICE: The product details indicated below are for general reference only and may vary based on the specific product approval and/or application. Always verify product details with the technical data sheet and consult with the Authority Having Jurisdiction (AHJ).

Max Pressure: 

250 psi (17.2 bar)

Response Type: 


Occupancy Type: 

Light Hazard, 
Ordinary Hazard

Thread Size: 

1/2" NPT (15 mm BSP)

Min Spacing: 

Per Standards / Listings

Max Spacing: 

Per Standards / Listings

Documents and Resources

Technical Data & Instructions

Revit® Files

Approval Certificates