Replacement Impeller


New member
Sep 22, 2019
Hello. My 1 HP motor finally gave up on my Pentair Pinnacle. I bought the same model as the existing to replace it. While taking apart the assembly, I started to consider replacing any worn parts. While inspecting the impeller, I noticed some groves worn into the part that nest inside the diffuser. So I did a search for a replacement and came to find out that the impeller I have is for a 1/2 HP. it seemed to work fine for years. So my question is, do I need to replace it due to small grooves, because it is for a 1/2 HP and what difference will I see if I get one designed to run with a 1 HP? And if I should replace, does anybody know the correct part/model# thanks image.jpg



Gold Supporter
Bronze Supporter
Sep 1, 2011
North Texas
Those grooves are where the impeller came in contact with something, probably debris, that lodged between the impeller and the diffuser. If it has worked previously, I see no reason to replace, unless the wall is so thin you think it might break off.