The Donaldson P621983 is a high-performance air filter designed to deliver superior filtration and engine protection. This genuine Donaldson filter serves as a direct aftermarket equivalent for the John Deere OEM part number RE312946. It is engineered to fit a wide range of John Deere agricultural and construction equipment, including various STS combines, S-series combines, 7R, 8R, 8RT, 8RX, 9R, 9RT, and 9RX series tractors. Key dimensions include an outer diameter of 325.9 mm, an inner diameter of 222 mm, a length of 332 mm, and a weight of 2.27 kg, ensuring precise fitment and reliable performance.