Built for reliable performance and easy installation, the Jagg part # 4550 oil filter adapter features a unique built-in oil by-pass valve and includes Pro Line swivel fittings for easy oil plumbing. Installs between the oil filter landing and the oil filter for easy access to the oil supply to install an oil cooler. Built-in thermostatic oil valve allows oil to by-pass the oil cooler until reaching operating temperature for faster vehicle warmup times.