MERCRUISER 4 INCH EXHAUST ELBOW (CAST IRON) | GLM Part Number: 51140; Mercury Part Number: 807988A2
In GLM's Mercruiser replacement 4 inch riser, there are two additional water jackets. This allows a higher volume of water to flow through the riser, keeping the engine cooler. *All risers are powdercoated black for maximum corrosion protection* **Cast Iron risers come with a 3 year warranty**
