Mercruiser 3 in. Exhaust Riser | Barr Marine MC-20-72963Mercruiser 3 in. Exhaust Riser Barr Marine MC 20 72963 Direct replacement exhaust elbow fits many Mercruiser inboards engines with log style exhaust manifolds. Barr Mercruiser inboard exhaust riser Fits Mercruiser 325, 330, 350, 370, and 400 model marine engines For use with 3 in. ID marine exhaust hose Rectangular bolt pattern 2 3 4" x 4 1 2" bolt centers Includes plugs, raw water gaskets and mounting hardware Heavy duty cast iron Painted black