User:Crunchy Numbers/sandbox

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Example:

|                                                      |
|   Low Level      High Level          Fill Valve      |
|------[/]------|------[/]---------------(OUT)---------|
|               |                                      |
|               |                                      |
|               |                                      |
|   Fill Valve  |                                      |
|------[ ]------|                                      |
|                                                      |
|                                                      |
|                                                      |