Standard Exhaust Valve. To fit ALL John Deere® tractor models with SN less than 214999, 6.404D EARLY POWER BOOSTER, 6CYL engines.John Deere Tractors: 4000 (SN less than 214999), 4010 (SN less than 214999, 6.404D 6CYL Engine), 4020 (SN less than 214999 6.404D 6Cyl Engine) series tractors.Replaces R32035, R44175








