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PTO Unit Brake Piston for Late model 86 series tractors, 3088,3288,3388,3488,3588,3688,3788,5088,5288,5488,6388,6588,6788 and also all CaseIH Magnum tractors. This is the brake piston to stop the pto. It is hydraulicly activated. There are 3 used in each PTO unit. They are sold in sets of 3. You will be shipped 3 pistons. These replace part#'s 1289335C5 and 67340C1