Hayward AstroLite SP0580S Light Lock Screw w/Fastener (SPX0580Z3) dialvalves A major replacement like this

A major replacement like this is especially useful when the damage is too central for smaller service parts to fully address

Useful when the original switch no longer sequences correctly

which means it directly affects how the water actually feels in use

it also benefits from a broad ecosystem of matching wet ends

Hayward AstroLite SP0580S Light Lock Screw w/Fastener (SPX0580Z3) dialvalves A major replacement like thisThe Hayward light lock screw with fastener is designed for compatible AstroLite SP0580S lighting applications where the light retention hardware needs replacement. A part like this is useful because it helps keep the light assembly properly secured while supporting cleaner service results and more dependable fitment. This replacement is especially useful when the original screw or related fastener is corroded, stripped, bent, or missing. Replacing it