Barr 20-0082 Center Style Exhaust Riser with 3" Exhaust Outlet. Replaces Sierra 18-1999, Osco 992 and Aquapower 5705F. Use on CHV-1-83, CHVA-1-84, FM-1-83 or OSCO 994, OSCO FL994 and OSCO CW994 collectors. It is also original equipment for many Marine Power engines. Comes with mounting bolts and RWC gasket. Made in the USA, 3-year limited warranty.