The John Deere WZ1400939 O-Ring is an authentic OEM sealing component designed for critical hydraulic and fluid systems in John Deere equipment. With an inner diameter of 14.0mm and a thickness of 2.0mm, this O-ring ensures a reliable, leak-proof seal, preventing fluid loss and contamination. Manufactured to John Deere's rigorous quality standards, it provides optimal performance and durability across a wide range of tractors and combines, maintaining system integrity.