These adaptors provide a simple and effective solution for connecting aftermarket hoses to your valve covers. Designed for valve covers that utilize push-in breathers, these adaptors easily install by pushing directly into the breather opening. Once installed, they provide a secure and leak-free connection point for AN10 or AN12 male hose ends, enabling you to plumb your desired PCV or breather system. Upgrade your engine's performance and appearance with these high-quality adaptors, perfect for custom builds or replacing worn-out components. Looking for a reliable proflow valve cover breather? This cover breather adaptor offers a universal push-in 1in. hose end to -10AN conversion, such as the PFE670-10BK Proflow valve cover breather adaptor universal push in 1in. hose end to -10AN, black, simplifying your installation process.