1/2 in. 155 Degrees F Quick Response Pendent Sprinkler Head Up to 5.6K Chrome - TMM
FR-QR Pendent Sprinkler (SS2551), QR, 5.6K, White - Head Only - Senju Sprinkler
Advantages of Return Bends in Fire Sprinkler Systems
VK3521 - Quick Response Pendent Sprinkler (K8.0) | Viking Group Inc.
TY-B Pendent SR K=80 1/2" - Bulb Standard Response (SR) & Quick Response (QR) - Standard Spray Sprinklers - Fire Sprinklers & Nozzles - Products | JCI Webshop
TUNA UL & CUL Listed 1/2"NPT Fire Sprinkler Head 155°F (68°C) Concealed Pendent Spray K80 Standard Response for Automatic Fire sprinkler System Concealed Head with White Cover Plate - - Amazon.com