4 in. Exhaust Riser | Barr Marine 20-0100 Exhaust riser for Barr generic center rise exhaust manifolds. Barr 4 in. generic exhaust riser Fits Barr CHV-1-83, CHVA-1-84, and FM-1- 83 generic center rise manifolds For use with 4 in. inside diameter marine exhaust hose 3/4 in. NPT cooling hose connection Includes plugs, gaskets and mounting hardware Heavy duty cast iron Painted black Replaces Marine Power 0992-040 !! Not Eligible For Free Shipping !!