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Based on your description, this wax oil pump requires high head and low flow rate characteristics. Both the OH6 type and the BB5 type are centrifugal pumps, but the OH6 type has a higher speed and is suitable for applications requiring high flow rates and low head pressure. The BB5 type is a fully enclosed multi-stage centrifugal pump, suitable for applications with low flow rates and high head pressures; therefore, the BB5 type is more appropriate. However, the BB5 model is more expensive because it is a multi-stage pump; it is generally used in high-pressure water pumps or air pumps, but under special conditions it can also be used for transporting other types of fluids. If your process requirements are not very strict, or if there are other types available, you can consider other models to reduce costs. But if the BB5 model must be used, it is also acceptable, as it meets your requirements for flow rate and head. .