1858/19 YL001 is an Alpha part originally produced in 1858. It is composed of two parts: a steel housing, and a highly durable rubber seal. The housing is designed to protect the rubber seal from wear and corrosion over time, ensuring consistent and reliable performance. The rubber seal is designed to provide an airtight and waterproof seal, ensuring that water and moisture do not enter the system. 1858/19 YL001 is used in a variety of applications, including automotive, marine, industrial, and other general purpose applications, and is often used in commercial and military equipment.