| 421 | Viking Intermediate Level In-Rack Sprinkler Models | |
| 422 | Viking VK598 - Upright Sprinkler (Storage-Specific Application) (K25.2) | |
| 423 | Viking VK592 - Standard Response CMSA Pendent Sprinkler (K19.6) | |
| 424 | Viking VK540 - Standard Response High Challenge® Upright Sprinkler CMSA (K11.2) | |
| 425 | Viking VK514 - ESFR Pendent Sprinkler (K28) | |
| 426 | Viking VK512 - ESFR Dry Pendent Sprinkler (K25.2) | |
| 427 | Viking VK510 - ESFR Pendent Sprinkler (K25) | |
| 428 | Viking VK506 - ESFR Pendent Sprinkler (K22) | |
| 429 | Viking VK504 - ESFR Dry Pendent Sprinkler (K16.8) | |
| 430 | Viking VK503 - ESFR Pendent Sprinkler (K17) | |
| 431 | Viking VK502 - ESFR Dry Pendent Sprinkler (K14) | |
| 432 | Viking VK500 - ESFR Pendent Sprinkler (K14) | |
| 433 | Viking VK520 - ESFR Upright Sprinkler (K14) | |
| 434 | Viking VK595 - Extended Coverage Upright Sprinkler (CMDA/CMSA) (K25.2) | |
| 435 | Viking VK580 - Upright Sprinkler (Storage-Density/Area) (K16.8) | |
| 436 | Viking VK536 - ELO Pendent Sprinkler (Storage-Density/Area) (K11.2) | |
| 437 | Viking VK533 - QR ELO Fusible Element Upright Sprinkler (Storage-Density/Area) (K11.2) | |
| 438 | Viking VK531 - QR ELO Upright Sprinkler (Storage-Density/Area) (K11.2) | |
| 439 | Viking VK530 - ELO Upright Sprinkler (Storage-Density/Area) (K11.2) | |
| 440 | Viking VK617 - Microfast® EC/QREC Light Hazard ELO Fusible Element Pendent Spk (K11.2) | |
| 441 | Viking VK537 - EC/QREC Ordinary Hazard ELO Fusible Element Pendent Sprinkler (K11.2) | |
| 442 | Viking VK535 - EC/QREC Ordinary Hazard ELO Fusible Element Upright Sprinklers (K11.2) | |
| 443 | Viking VK603 - QREC Fusible Element Pendent Sprinkler (K 8.0) | |
| 444 | Viking VK613 - Microfast® HP EC/QREC Fusible Element Horizontal Sidewall Sprinkler (K5.6) | |
| 445 | Viking VK609 - Microfast® EC/QREC Fusible Element Horizontal SidewallSprinkler (K5.6) | |
| 446 | Viking VK611 - Microfast® HP EC/QREC Fusible Element Pendent Sprinkler (K5.6) | |
| 447 | Viking VK601 - QREC Fusible Element Pendent Sprinkler (K5.6) | |
| 448 | Viking VK680 - QREC Concealed Horizontal Sidewall Sprinkler (K8.0) | |
| 449 | Viking VK638-D - QREC Concealed Horizontal Sidewall Sprinkler (K8.0) | |
| 450 | Viking VK638 - "Corridor Sprinkler" - QREC Horizontal Sidewall Sprinkler (K8.0) | |