Marineland 12-Pack Penguin Rite Water Filter Cartridge, Size C
Rite-Size C fits Penguin 200B, 350B, 330B and 170B.Rite-Size B fits Penguin 150B, 110B and 125B.Rite Size C fits Penguin 200B, 350B, 170B and 330B. Value Pack contains (2) 6-Packs.