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Not all water pumps are the same. Here’s what makes our water pumps stand out. High-Strength Steel Bearing. GMB has manufactured bearings for over 75 years in the global market for both the OEM and aftermarket industries. GMB has studied all aspects of bearing manufacturing to design the highest-quality bearings with proper high-grade steel, precision bearing race machining and polishing, and proper grease selection. GMB uses roller bearings for all high-load applications. GMB Mechanical Shaft Seals are made with proprietary elastomers and agents for protection and sealing power. GMB Shaft Seals utilize carbon and ceramic sealing surfaces for superior wear resistance. GMB Water Pump Housings are manufactured to match the exact OEM-spec materials (cast iron, aluminum, or stamped steel). Each housing is precision measured using state-of-the-art technology to be dimensionally correct up to a 99% accuracy with strict tolerance limits. GMB Water Pump Impellers are manufactured to match the exact OEM-spec materials (metal or polymer composite) based specifically on the OEM design. Each impeller is also precision measured to be dimensionally correct up to a 99% accuracy with strict tolerance limits.