for Penn-Plax Impeller with Shaft For Cascade 1000 Canister Filters, Pump Accessory for Cascade 1000 Replacement Impeller with Stainless Steel Shaft Improves filter efficiency and water circulation Packing includes: 1Pcs impeller and 1pcs Shaft for Penn-Plax Impeller with Shaft For Cascade 1000 Canister Filters, Pump Accessory for Cascade 1000 Replacement Impeller with Stainless Steel Shaft Improves filter efficiency and water circulation Packing includes: 1Pcs impeller and 1pcs Shaft