Hayward Matrix SP1591 SP1592 SP1593 Volute (SPX5500A) topsideoverlays and any printed cross-reference numbers

and any printed cross-reference numbers on the old filter before ordering

this mounting kit helps support dependable spa cover lift operation and stronger long-term serviceability

0 horsepower fit gives this diffuser practical value because internal hydraulic parts work best when they match the intended pump and wet-end relationship closely

they are also buying into a platform backed by matching wet ends

Hayward Matrix SP1591 SP1592 SP1593 Volute (SPX5500A) topsideoverlays and any printed cross-reference numbersThe Hayward volute is designed for compatible Matrix SP1591, SP1592, and SP1593 pump applications where the main wet end housing needs replacement. A volute like this is useful because it forms the chamber around the impeller and helps direct water through the pump, making it essential to hydraulic performance and structural integrity. This replacement is especially useful when the original volute is cracked, warped, leaking, or otherwise too damaged