V6 Exhaust Tube | Sierra 18-2770Rubber exhaust hose connects exhaust manifold to exhaust Y-pipe on various V6 Mercruiser marine engines with 1 piece exhaust manifold. Fits Mercruiser 4.3L marine engines with one piece exhaust manifold 3 3/4 in. ID inlet 4 in. ID outlet 5 in. long Replaces Mercury 32-807458T Replaces Mallory 9-72804