This gear cover plug is a perfect fit for Cummins ISX and QSX X15 engines. It is designed to provide optimal coverage and protection for your engine's gear box. The plug is made of high-quality materials and is built to last. With its precise design and perfect fit, this gear cover plug is a must-have for any commercial truck owner who wants to keep their engine running smoothly and efficiently. It is easy to install and does not require any additional modifications to your truck. Buy now and enjoy the peace of mind that comes with knowing your engine is well-protected.