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General Pump "T 47 Series" T1321 2100psi 5.5gpm Solid Shaft pump-brand_interpump General Pump - Interpump 66General Pump T 47 series T1321 triplex pressure wash pump. 2100 PSI Maximum Rated Pressure 5. 5 GPM @ 1150 RPM Shaft Diameter: 24mm (shaft extensions on both sides of pump) Inlet: 1 2" FPT Outlet: 3 8" FPT Unloader sold separately. Do not install pump without unloader or pressure regulator. Professional installation is recommended.