Response to Hello, Mike. The replacement motor and shaft seal for the SP4010X15NS is the USN1152 - A.O. Smith 1 1/2 HP Up Rated Motor and the SPX4000SA2 Seal Assembly. We also offer the Tune Up Kit Hayward Northstar 4000 Series Pumps (Pre-2003) - GOKIT66. You may click here to view the schematic for all parts available to order.

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