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This coupler transmits the power from the electric motor, gasoline engine, diesel engine, air motor or hydraulic motor to the 28mm shaft of a P400 series or SP series pump.  It directly couples the two keyed crankshafts together, so that as the driver crankshaft rotates, the pump crankshaft rotates at the same speed.

WARNING: This product might contain a chemical known to the State of California to cause cancer, and birth defects or other reproductive harm. For more information go to

Specification US Metric
Fits ModelsP400
Pump Shaft Size28 mm
Motor/Engine Diameter284T/286T
Weight7.9 lbs.3.6 kg
The repair kits listed to the right are available for this pump. If you need further information about these repair kits, or have questions about other specific parts for your pump, please contact you local Giant distributor or contact Giant customer service.
No repair kits available. To replace this item please contact Giant Customer Service.


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  • Giant Industries Limited Warranty


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For 50 years, Giant Pumps has offered the most dependable positive displacement high-pressure triplex pumps available. Designed and built to the highest quality standards, customers count on Giant Pumps products to keep their equipment running. Every design detail of Giant Pumps products is optimized for long-life and reliable performance, making Giant Pumps the most trusted name in high-pressure pumps and systems.

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