Patent pending reed valve crankcase breather from S&S that really helps to resolve oil carry over problems in Twin Cams. Breather consists of a machined billet aluminum body with four steel reed valves. The valve body slides over the pinion shaft and inside the pinion bearing bore, and is contained between the pinion bearing outer retaining ring and the oil pump. The reed valves allow oil and mist to escape from the crankcase, but not allow them to reenter. Two versions available, one that fits 1999 thru 2002 Twin Cam "A" engines, the other to fit 2003 to present Twin Cam "A" engines. These breather valves are not available for Twin Cam "B" engines as used in Softail models.