Reliable GXLO Standard Response (SR) Upright (R2921) Fire Sprinkler Head
This Reliable Standard Response (SR) Upright Fire Sprinkler features a glass bulb activating at 165F with a 11.2 K-Factor, and 3/4 in. threads. Each Upright head features a Brass Frame, Bronze Deflector, and the Sprinkler Identification Number (SIN) is R2921. This is a Standard Response (SR), Standard Coverage sprinkler with a maximum working water pressure of 175PSI (UL & FM).
The GXLO Upright sprinkler delivers effective, affordable defense against fire. Using a heat-activated Fusible Link assembly, this automatic fire sprinkler opens when ambient temperatures reach 165F, drenching the area surrounding a fire to keep it in its place of origin.
Reliable GXLO Standard Response (SR) Upright (R2921) Sprinkler Head Listings and Approvals
Each GXLO Upright sprinkler is made by Reliable, a global leader in fire protection manufacturing. When installed properly, this fire sprinkler head is UL, FM, cULus Listed listed. Refer to the datasheet for listings and approvals in specific temperatures and/or applications.
This Upright fire sprinkler is designed to connect seamlessly to wet piping systems, providing dependable fire suppression when it matters most. Engineered for high performance, it delivers fast and uniform water distribution during emergency activation. Built for long-term reliability, this sprinkler head requires minimal maintenance and supports quick, straightforward installation. Whether you're replacing an existing unit or installing a new system, this fire sprinkler meets key industry safety standards and enhances overall fire protection efficiency.
Reliable GXLO (R2921) Upright Sprinkler Installation and Other Information
- Care:
Be careful when handling, as over-tightening can damage the 3/4 in. threads or the sprinkler itself. Avoid dropping or exposing the sprinkler to unnecessary impact, which could affect performance. Do not install if the unit appears damaged or compromised in any way. Store in a clean, dry environment to prevent contamination or mechanical damage. Always refer to the datasheet for proper storage and installation guidelines to ensure optimal performance and compliance with safety standards.
- Finishes & Temperatures
This Upright sprinkler features a Chrome finish and activates at 165F. Available finish options include Bronze, Chrome.
Temperature options include 165F, 212F, 286F.
- Accessories
The GXLO (R2921) listed accessories include: Model H Sprinkler Wrench, Model W15 Sprinkler Wrench, Model D-6 Guard, Model D-7 Guard, Model D-8 Guard.


