Hayward SPX4000B Diffuser Replacement for Hayward Northstar Pump Diffuser replacement Fits hayward northstar sp4000 pump series models sp4005(ns), sp4007(ns), sp4010(ns), sp4015(ns), sp4020(ns), sp4030(ns) Also fits hayward northstar sp4000x pump series models sp4007x10(ns), sp4010x15(ns)/2(ns), sp4015x20(ns)/2(ns), sp4020x25(ns)/2(ns), sp4025x30(ns), sp4015x202 Weighs 4-pound