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Johnston & Jeff Signature Green Cast Seed Feeder. This feeder uses a heavy-duty cast lid and base, metal feeding ports and a strong polycarbonate tube. To fill, just lift the lid, then replace when done.. Hang at least 1.5m (5') from the ground and away from trees and bushes for protection.. Sizes. 2 Port 20cm. 4 Port 30cm. 6 Port 40cm