Reliable™ R3121 Upright Sprinkler | QR | 2.8K | Chrome | 165F | GFRU3C

Reliable™ GFR Quick Response Upright (R3121) Fire Sprinkler Head

The Reliable™ GFR Upright Fire Sprinkler, SIN R3121, features a chrome finish, a 165F (74C) fusible link heat element, and a 2.8K flow rating. This upright sprinkler connects using a 1/2 in. NPT thread and is built with a brass frame and brass deflector. The manufacturer part number is GFRU3C.

Designed for quick response and standard coverage, this model activates automatically at 165F through its heat-sensitive fusible link. The chrome finish adds a clean, reflective look suitable for exposed piping or open-ceiling environments where upright sprinklers are installed.

This sprinkler is UL Listed and cULus Listed, ensuring verified performance when installed according to the manufacturer’s specifications.