John Deere Original Equipment O-Ring 

 OEM Water Pump

Part Number:     R71596

R71596 O-Ring Deere parts 693C, 790, 540E, 690C, 410E, 644D, 370E, 892DLC, 770A, 460E, 850B, 790D, 540G, 1200, 643G, 770B, 690CR, 644E