K&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 adapts a 3-1/2 inch to a 3-1/4 inch tube and is 2-1/2 inches in length.
K&N Rubber Hose Coupler - 3-1/2in to 3-1/4in ID x 2-1/2in L