Hayward Super II 2 HP Impeller | SPX3021C Standard 2.5" They also have grooves on

They also have grooves on the backside where the springs are to be installed that helps the movement of the flaps

Upgrade your pool's filtration system with this high-quality component for a seamless pool experience

this union can be hand-tightened for simplicity and ease

accommodating internal and external fitments to streamline installation in new systems or retrofits

Hayward Super II 2 HP Impeller | SPX3021C Standard 2.5" They also have grooves onHayward Super II 2 HP Impeller SPX3021C Impeller replacement Fits hayward super ii pump sp3000 series models sp3007(eeaz), sp3010(eeaz), sp3015(eeaz), sp3020(eeaz), sp3025(eeaz), sp3030(eeaz) Also fits hayward super ii pump sp3000x series models sp3005x7(az), sp3007x10(az), sp3010x15(az), sp3015x20(az), sp3020x25(az), sp3025x30(az) 2 horsepower