This device allows you to change filter cartridges without loosening Filter Screws and without removing the Filter Holder from the Flo King pump. Just remove threaded nut at bottom of stem, slip off old cartridge, slide on new cartridge, tighten nut, and resume filtration. Nut-Style Filter Holder is compatible with Poly-Spun disposable, standard (non-Permacore) Magnum and Super Magnum reusable filter cartridges, and High-Flow Carbon Cartridges.

Trade-off: Nut-Style Filter Holder results in a flow-rate reduction of 10% compared with mounting bare filter cartridge directly to pump or using Permacore reusable cartridge.
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