National Oil Seals feature the following: A proprietary RediCoat sealant to eliminate bore leakage. Patented lay-down sealing lip design ensures long life in spite of extreme temperatures, shaft imperfections, shaft/bore misalignment and excessive shaft thrust or movement. Closeout Inventory Warranty Information Wholesaler Closeout items have a 30 day warranty (but still are covered by our Return Policy). NATIONAL Regular Inventory Warranty Information 12 months