Select-o-Speed Inner Front Single Speed PTO Shaft Seal
Ford Tractor 611, 671, 771, 811, 871, 971
Ford Tractor 2000, 3000, 4000 (3 Cyl)
313734, NAA4676A
1.375" ID - 2.378" OD - .312" Width
Please check your model (measurements) to ensure this is the correct seal required for your model.