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The 500P propane bobtail
500P
For Propane Bobtails 

The 500P utilizes a small amount of the propane you're pumping to cool the hydraulic system. This propane is heated by the hydraulic oil and then returned into the tank, stabilizing the system. This allows us to eliminate the fan motor, producing a smooth and quiet design. In addition, by having a more stable pump, we reduce product pump cavitation which increases pump flow rates and reduces maintenance costs.