This is the gasket that fits between F2426R and the outer cover shown in picture two and three. This was the earlier ventilator pump on power steering equipped tractors from 50 -730 that our gasket fits. Always check your parts manual and casting numbers carefully when ordering number series parts. we use a rubber blend gasket material for increased oil resistance. We thoroughly research our parts to give as much value and fit as possible. This gasket is no longer available from Deere.