The ATP B4Z-S Clockwise, Mechanical Seal style pump is the Self-Priming 4 x 4 Centrifugal Frame Mounted Water Pump used when suction loading is required on most over the road trucks using a platform mount, or other larger-scale applications. This pump has Female Pipe Threads on both the suction and discharge side for easy removal and repair, and at 2800 RPM performs at a rate up to 750 GPM at 77 PSI. This pump will NOT fit a 2K or 4K truck, and includes a Hydraulic Drive Adaptor, 115-B07779 . Also available without adaptor.