Unicel Swimming Pool/Spa PIN20 FC 3752 Intex Replacement Filter Cartridge C5315

15 Square Foot Intex "B" filter. Replacement for: Intex Recreation Type "B" (Note: Cartridge may be used in filter model 520/530 with adapter supplied by Intex.); Intex Recreation Type "B" (Note: Cartridge may be used in filter model 520/530 with adapter supplied by Intex.); Intex Recreation 59905 (Note: Cartridge may be used in filter model 520/530 with adapter supplied by Intex.); Intex Recreation 59905 (Note: Cartridge may be used in filter model 520/530 with adapter supplied by Intex.)