Response to Hi Chris, so that metal collar on your impeller is actually the inner part of your old shaft seal. You will need to remove that using pliers. For your model SP2615X20 Hayward Super Pump, you can use shaft seal part number 5110-11 for a standard chlorine swimming pool and part number 5250-235 for a saltwater swimming pool. Here is a guide that we put together called "How To Replace a Pool Motor Shaft Seal" that may also assist. 

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