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- Water pumps - engine-driven
- AR - Reduction gear for combustion engine
AR - Reduction gear for combustion engine

Annovi Reverberi reduction gear for connecting a diaphragm pump to a combustion engine.
- The combustion engine must have a 1" (25,4mm) shaft, such as Honda GX270 / GX390, and SAE J609a flange
- Compatible with:
AR50-SP
AR503-SP
AR813-C/SP - AR813-CSP
AR1064-C/SP - AR1060-CSP
| Code | Transmission ratio | Package size (SRJ) |
|---|---|---|
| AR-1639 | 1:5,9 | 1 |

