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5/16"-18 Wing Nuts — Fit American Turbine AT309 and Berkeley 12JC Jet pumps
- Made of stainless steel
| For use with the following: | Qty. Required | Diagram Fig. No. |
| American Turbine AT 309 with B1007 Bearing —Use with serial # 0 to 25648 | 4 | 35 |
| American Turbine AT 309 with HP Bearing—Use with serial # 25649 to present | 4 | 35 |
| Berkeley 12JF | 2 | 36 |