Case 446 Garden Tractor Mower Rear Hydraulic PTO Control Valve. The PTO valve was in good working condition when it was taken off of the Case 446 tractor. The rear hydraulic PTO control valve is used with Case Ingersoll Tractors for powering a hydraulic Rototiller and/or wood splitter. Asking $135 obo. If this ad is still posted then the item is still for sale.