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Hello- Thank you for your question. We are happy to help! All standard sink flanges are about 4.5 inches in diameter. The current GE Appliances disposer line also has a sink flange of about 4.5 inches in diameter and is made of super tough plastic the will not break or rust and is easier to install. The GE Appliances sink flange has a thin polished Stainless Steel cover that makes it look like chrome. We hope this is helpful! Thank you! Joyce@GEA
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