Pentair WhisperFlo® Impeller 1.5HP | WhisperFlo Pump | 073129Z AOP Pool Systems as an uneven substrate will

as an uneven substrate will prevent a proper seal regardless of part condition

also inspect your four smaller secondary filters (Unicel C-4401) and replace the full set together for optimal system performance

When replacing the shaft seal

and Cristal-Flo II filter systems

confirm 520736 matches the part number printed on your existing flow switch or listed in your IntelliChlor installation manual

Pentair WhisperFlo® Impeller 1.5HP | WhisperFlo Pump | 073129Z AOP Pool Systems as an uneven substrate willThe Pentair WhisperFlo Impeller (073129Z) is the OEM replacement 1. 5HP impeller for the WhisperFlo series inground pump covering models WF 6, WF 28, WFE 6, WFE 28, WFK 6, WFDS 6, and WFDS 28. The impeller is the rotating component at the heart of your pump's hydraulic assembly. It draws water through the strainer housing and drives it toward the filter and return lines. A cracked, worn, or clogged impeller reduces flow rate and puts unnecessary load