Replace for Part Number: 21122541. Oil separator for Volvo truck's 21122541,20499419 mounting gasket included 20532891 please see pictures. Made by leading factory, our products are reliable and durable. 100% quality assurance tested, more responsive, less expensive, easier to install. High quality components and materials. Communication is the best way to solve the problem. Please don't open cases or return requests without contacting us. I will give you a satisfy solution. Product does not come with installation instructions, please refer to a shop/factory manual for installation.