The Vaico Breather System Kit - 138157 is a comprehensive kit designed to improve the performance and functionality of a car's breather system. The kit includes four essential products that work together to maintain the proper functioning of the breather system. These products include a breather hose, a breather valve, a breather filter, and a breather pipe. The breather hose is responsible for carrying excess gases and vapors from the engine to the breather valve. The breather valve then regulates the flow of these gases and vapors into the breather filter, which removes any impurities before they are released into the atmosphere. Finally, the breather pipe directs the clean gases and vapors back into the engine, ensuring efficient combustion and reducing emissions. This kit is suitable for a wide range of car models and is an essential maintenance tool for any car owner.