I should have mentioned that the red space is supposed to be on the outside of the rotor. That rotor has swelled cutting down on the water pumped. . . 😉
DO you have a part# I have one that looks like that but I need a part# so I can find it. Just found the impeller I have #550040 the price is $8.50 CND plus shipping. Check the number to ensure it is the right one. Mine is NOS.