Darlly SR400 S7M120 Inner Outer Spa Pool Filter Cartridge controlsystems The WG1049AVPAK2 is a practical The WG1049AVPAK2 is a practical service part when a compatible Hayward vinyl or fiberglass setup needs outlets to restore dependable suction point coverage Supports cleaner restoration and fit accuracy and this Darlly Filtration SR400 S7M400 pack is designed for compatible applications where a coordinated replacement helps maintain balanced filtration performance The SR400 and S7M400 references give this pack practical value because multi cartridge systems work best when the replacement elements are matched to the intended filter family