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Waterway Spa Pump Impeller Hi-Flo Series 2 in. SD/CS 48 frame 1.0 HP fits pumps rated 115 volts 11.2 to 12.0 amps. Genuine Waterway Pump Parts for Hot Tub, Spa applications. 310-4000 3104000 Impeller is 30% glass-filled Noryl. Does not include seal assembly. Use Waterway pump seals WW3193100B shown on Waterway pump parts list