Air Injection Check Valve: Labor Times
| Standard Hours | Manufacturer Warranty Hours | Skill Level | Notes | |
| Replace | ||||
| Cylinders 1-6 | 0.7 | 0.6 | B | |
| Cylinders 7-12 | 0.6 | 0.5 | B | |
| Both | 1.4 | 0.9 | B |
| Standard Hours | Manufacturer Warranty Hours | Skill Level | Notes | |
| Replace | ||||
| Cylinders 1-6 | 0.7 | 0.6 | B | |
| Cylinders 7-12 | 0.6 | 0.5 | B | |
| Both | 1.4 | 0.9 | B |