O-Ring Retainer for Impeller by Penn-Plax

Penn-Plax Cascade 500 Canister Filter Replacement Impeller (CCF115)

Penn Plax Pro-Carb Filter Bags for All Canister Filters – Filled with Activated Carbon for Clean Aquarium Water – 8 Ounces, 2 Pack

Penn Plax CCF131 Cascade 500 GPH Floss Pads, 6-Pack

Cascade 500 Canister Filter Parts F. Gasket by Penn-Plax

Penn Plax Cascade 500/350 GPH Canister Filter Aquarium Bio Sponge Replacement; 1 Pack

Penn Plax Cascade 500 GPH Canister Filter

Penn Plax Cascade 500 GPH Floss Pads, 24 Pads Total (4 packs with 6 pads in each pack)

Penn Plax Cascade 700 1000 GPH Floss Pads – Filter Pad Keeps Your Aquarium Clean and Clear – 6 Pack