Automatic thermostatic oil bypass valve allows oil to bypass the oil cooler until reaching operating temperature for faster vehicle warm-up times Flows oil through the filter first, for better flow Stock-to-Jagg oil filter nipple PART #0713-0081 is required when converting from stock H-D oil filter adapters to Jagg oil filter adapters; available separately Made in the U.S.A. ADAPTER OIL FILTER W/TSTA