Stem connected to servo motor that stops and starts the flow of LN from the LN manifold to the graphite reactors.
| Bill Of Materials | Qty | Unit | Total | Notes |
| FEP rod 250 | 55 | in | 49.50 | |
| labor assembly/fabrication (min) | 45 | min | 41.40 | |
| labor machining (min) | 75 | min | 80.25 | |
| LN valve stem | 16 | ea | 171.15 |
| Used on | Qty |
| actuator LN valve | 1 |
| LN manifold upgrade | 1 |