Fluval 306 External Filter for aquariums up to 300L

Model: AP-3 2 Outlets Free Air Stone (A-001 - 25 (L) x 12mm (D) ) x 2

5 x Replacement Compatible Biorb Filter Service Kit Simply remove old media from your filter, retaining the plastic housing, and insert our media replacements, followed by the foam ring. This kit contains 5 x foam rings, and 5 x sachets of Carbon/Zeolite Mix.