| Code | Drift_Diameter |
| Name | Drift Diameter |
| Parents | Property > Length > Diameter > Inside_Diameter |
| Description | Largest diameter of a perfect cylinder of a specified length that can fit into the pipe. Because a pipe is never perfectly cylindrical but slightly oval the drift diameter is always smaller than the quoted inner diameter. The drift diameter is used to know if a given pipe or instrument will run into a pipe. |
