Modified Bellow sealed valve with copper stem tip.
| Bill Of Materials | Qty | Unit | Total | Notes |
| 4BSV gasket | 1 | ea | 13.95 | |
| bellows-sealed valve 1/4 | 1 | ea | 301.42 | |
| BSV vented Cu stem tip | 1 | ea | 79.54 | |
| labor assembly/fabrication (min) | 10 | min | 9.20 | |
| 4BSV with vacuum stem tip | 1 | ea | 404.11 |
| Used on | Qty |
| vacuum system - WHOI | 38 |
| 4BSV + actuator | 1 |