This Master Flow 7 in. to 4 in. Round Reducer is constructed from durable 30-gauge galvanized steel designed for HVAC transition applications. It features hemmed collar edges to provide enhanced strength and a secure, improved fit when connecting a 7-inch pipe to a 4-inch pipe in a duct run. Ideal for increasing or decreasing pipe sizes in ventilation systems, it can be crimped if necessary for custom installations

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