Type DRV and TRV, Right Angle, Vertical Output Shaft, gear drives are available with torque ratings up to 5,000,000 inch-pounds in gear ratios up to 238:1. Special output shaft bearings for down thrust, an oversized housing for maximum self-cooling thermal capacity, a shaft driven pump for force feed lubrication, and special corrosion resistant hardware and epoxy paint make this design particularly suitable for the most severe environments, such as cooling towers. In addition, this type of unit is also available with similar features, but with output shaft down and "dry-well" (zero leakage) construction. This configuration is most appropriate for chemical process vertical mixers, vertical pump drives and aeration drives.