The ATP B4J-S Clockwise, Mechanical Seal pump is a high pressure, Hydraulically driven, 5 x 4 Flanged water pump with a 13.5 Impeller. This pump is driven directly by a SAE C 4-Bolt Mounted 1 1 / 4 14 tooth Splined Shaft hydraulic motor coupled to the water pump shaft with a 116-M10176 coupling. When operating at 2,500 RPM this pump is capable of 1,150 GPM at 208 PSI and is primarily use on Off Road , larger mine tank equipment. This ATP Water Pump is a direct replacement for Berkeley Pump B4 Mega (B69743).