Victaulic® FireLock™ S34KCJQ510 FL-QR/SW V3410 Automatic Sprinkler With FireLock™ Style V9 IGS™ Grooved Sprinkler Coupling, 175 psi Pressure, 2-15/16 in OAL, 3/4 in Thread, 8 Nominal K-Factor, NPT Connection, Domestic