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3 inch inside diameter2-1/2 inches longConstructed from durable reinforced rubberDesigned to be used as a replacement part or for custom do-it-yourself applicationsK&N rubber hose couplers are designed to connect intake tubes for custom do-it-yourself racing air intake applications or used as a replacement part. K&N couplers are constructed from high-quality reinforced rubber and made to last. This coupler connects two 3 inch tubes and is 2-1/2 inches in length.