Fluval FLEX Foam Filter Block for Fluval Flex Aquarium, 15 US Gal (57 L)
The Flex Foam Filter Block provides effective mechanical filtration by trapping large particles and debris.
Foam Filter Block is suitable for:
Flex 15 US Gal / 57 L (Item# 15006, 15008)
Flex 32.5 US Gal / 123 L (Item# 14494)