The NIBCO 29008016 O-Ring Kit includes a selection of FKM O-rings, specifically designed for 4-inch applications. FKM, known for its high resistance to heat, chemicals, and aging, makes these O-rings ideal for demanding environments. This kit provides a comprehensive solution for sealing needs in various industrial systems, ensuring leak-free operation. Each O-ring is manufactured to precise specifications, ensuring compatibility with a wide range of fittings and valves. Perfect for maintenance and repair tasks, this kit is essential for professionals seeking reliability and performance.