This Mercury 4 Stroke 2.5 HP Short Lower Unit Gearcase 15" PN 898103t73 is a reliable and high-performing part for your outboard engine. It is designed with a 4-stroke engine. The manufacturer part number is 898103T73. This lower unit gearcase is compatible with a range of Mercury outboard engines and is perfect for those who are looking for a replacement or an upgrade. It is made from high-quality materials and is designed to withstand the rigors of all types of marine environments.