Waterway 1.0 HP SVL56 Champion High Pressure Pump Impeller [High Head] (310 7410) ultrapurewater Correct matching matters because the Correct matching matters because the wet end needs to preserve the original plumbing geometry and water path if the final repair is going to feel natural and dependable and SPST relationship gives this timer its practical value because time control components work best when they match the original switching style and electrical role closely 0 HP high head impeller has worn out and the repair needs the correct performance oriented fit This Waterway impeller is a practical replacement when the original 1