| • | Bad welds | 
| • | Scoring on the band contact surface | 
| • | Heat damage | 
| • | Dishing or flatness of band surfaces | 
| • | Bushing cracks, damage, or scoring | 
| • | Damage or cracks | 
| • | Seal grooves for burrs, nicks, or distortion | 
| • | Wear or burning | 
| • | Backing plate for damage, cracks, or burning | 
Important: The ball check valve must be in its seated position before you perform the leak test.