Proper lubrication of your turbocharging system is crucial to the longevity and performance of your powertrain. In the past, lining up the gasket and bolts during installation was a tricky task. Gone are the days of fumbling to fit traditional paper or cork gaskets that are prone to failure. The HPS Turbo Oil Return Flange is designed with a groove machined in the flange to accept an oil resistant O-ring to create a leak-free seal onto the turbo. It also features a AN-10 male bung to allow ample flow of oil back to your oil pan. HPS Turbo Oil Return Flanges are Type II anodized black to provide a durable, scratch and corrosion resistant finish.