| 541 | Viking VK355 - Microfast® Quick Response Fusible Element Conventional Sprinkler (K8.0) | |
| 542 | Viking VK351 - Microfast® Quick Response Fusible Element Upright Sprinkler (K8.0) | |
| 543 | Viking VK309 - Microfast® Quick Response Fusible Element Vertical Sidewall Sprinkler (K5.6) | |
| 544 | Viking VK320 - Microfast® HP Quick Response Fusible Element Horizontal Sidewall High Pressure Sprinkler (K5.6) | |
| 545 | Viking VK307 - Microfast® Quick Response Fusible Element Horizontal Sidewall Sprinkler (K5.6) | |
| 546 | Viking VK318 - Microfast® HP Quick Response Fusible Element Pendent High Pressure Sprinkler (K5.6) | |
| 547 | Viking VK303 - Microfast® Quick Response Fusible Element Pendent Sprinkler (K5.6) | |
| 548 | Viking VK311 - Microfast® Quick Response Conventional Fusible Element Sprinkler (K5.6) | |
| 549 | Viking VK316 - Microfast® HP Quick Response Fusible Element Upright High Pressure Sprinkler (K5.6) | |
| 550 | Viking VK301 - Microfast® Quick Response Fusible Element Upright Sprinkler (K5.6) | |
| 551 | Viking VK332 - Microfast® Quick Response Fusible Element Pendent Sprinkler (K4.2) | |
| 552 | Viking VK328 - Microfast® Quick Response Fusible Element Upright Sprinkler (K4.2) | |
| 553 | Viking VK346 - Microfast® HP Quick Response Fusible Element Horizontal Sidewall High Pressure Sprinkler (K2.8) | |
| 554 | Viking VK334 - Microfast® Quick Response Fusible Element Horizontal Sidewall Sprinkler (K2.8) | |
| 555 | Viking VK343 - Microfast® HP Quick Response Fusible Element Pendent High Pressure Sprinkler (K2.8) | |
| 556 | Viking VK330 - Microfast® Quick Response Fusible Element Pendent Sprinkler (K2.8) | |
| 557 | Viking VK341 - Microfast® HP Quick Response Fusible Element Upright High Pressure Sprinkler (K2.8) | |
| 558 | Viking VK326 - Microfast® Quick Response Fusible Element Upright Sprinkler (K2.8) | |
| 559 | Viking VK338, VK339 - Microfast QR Stainless Steel Sprinklers (K5.6) | |
| 560 | Viking VK360 - Quick Response Horizontal Sidewall Sprinkler (K8.0) | |
| 561 | Viking VK306 - Microfast® Quick Response Vertical Sidewall Sprinkler (K5.6) | |
| 562 | Viking VK319 - Microfast® HP Quick Response Horizontal Sidewall Sprinkler (K5.6) | |
| 563 | Viking VK305 - Microfast® Quick Response Horizontal Sidewall Sprinkler (K5.6) | |
| 564 | Viking VK337 - Microfast® Quick Response Vertical Sidewall Sprinkler (K4.2) | |
| 565 | Viking VK344 - Microfast® HP Quick Response Horizontal Sidewall High Pressure Sprinkler (K2.8) | |
| 566 | Viking VK333 - Microfast® Quick Response Horizontal Sidewall Sprinklers (K2.8) | |
| 567 | Viking VK3311 - Microfast® Quick Response Pendent Sprinkler (K4.2) - VdS Approved (Germany) | |
| 568 | Viking VK478 - Quick Response Flush Pendent Sprinkler (K5.6) | |
| 569 | Viking VK462, VK464 - Mirage® QR Concealed Pendent MRI Sprinklers (NON-FERROUS) | |
| 570 | Viking VK469 - QR ELO Concealed Pendent Sprinkler (K11.2) | |