| Connection | Requirement | Consequence if Ignored | | :--- | :--- | :--- | | | Flooded suction or positive head of 3-10 feet | Cavitation, damaged plungers | | Inlet Hose | 3/4” minimum, reinforced, no kinks | Starvation, pressure fluctuation | | Outlet (Discharge) | High-pressure hose rated for 3000+ PSI | Burst hazard | | Unloader Valve | Must be installed on outlet side | Pump will overheat and explode |
If you have lost your original , download a PDF from a reputable pressure washer parts site or contact Duro customer support with your serial number. Keep a printed copy in your workshop – when the pump fails on a Saturday afternoon, you will be glad you have it. duro k255 piston pump manual