Replace freeze damaged or corroded exhaust risers easily For 50 years Sierra has been producing parts engineered to meet or exceed the specifications of marine engine manufacturers and has gained the confidence of engine manufacturers and boat builders to a point of supplying them with OEM parts. Boaters and technicians can be assured a Sierra part will fit right the first time and restore function to OEM specifications. Sierra riser kits include all you will need to for a quick installation. Each riser is an exact OEM match and is leak tested for quality assurance. Mating surfaces are CNC machined to provide the best possible seal without additional preparation. Precision castings feature uniform wall thickness and are primed and painted to stand up to the marine environment. Look no further than a Sierra kit for quick out of the box installations. Key Features Meets or exceeds manufacturer specifications Risers can be used on port or starboard side Includes riser, exhaust manifold gaskets Fits many Ford and GM center rise manifolds used in Volvo Penta applications and Sierra 18-1931-1 center rise manifolds Backed by SeaStar Solutions Limited Two-Year Warranty The Sierra Engine Parts Selector In addition to exhaust manifolds, we offer a wide variety of other engine parts manufactured by Sierra. To see if we have the part you need, see ourEngine Parts Selector, where you can search by engine make, serial number and model or year of manufacture.ApplicationOEM Part NumberBarrVO-20-855384GLM51510HGE5384Mallory9-40910Osco56879Volvo Penta855384-4, 856891