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Today's Hours 8am - 11pm estThe 4" Ferrule is a fitting used within the Rheia ducting system to connect two sections of pipe together. It is specifically designed to fit over the end of a 4-inch diameter pipe and is made of stainless steel. The ferrule is used in conjunction with a clamp to create a secure and leak-proof connection between two pipes or between a pipe and a fitting such as a valve or pump.