The Lower Unit Gasket Seal Kit with Drain Screws is specifically designed for 9.9 HP and 15 HP outboard engines, ensuring a perfect fit and compatibility. This kit replaces the 396350 part number, making it easy to install and replace worn-out seals. The drain screws allow for easy removal and replacement of the gaskets, ensuring a leak-free seal and extending the engine's lifespan. This kit is made of high-quality materials that will withstand the rigors of marine environments, providing a leak-free seal and maintaining engine performance. It's a must-have product for any boat owner or mechanic looking to maintain and repair their outboard engines.