Fitted internally the engines valves are often overlooked. Also known as poppet valves they work in an opening and closing manner. They are used to open and close the inlet (intake) and outlet (exhaust) ports in the cylinder head. There are numerous reasons why these may be replaced but they must be in order for the engine to run efficiently. At Aceparts.co.uk we stock a wide range of quality valves for all types of cars and vans, so we're 99.9% sure we will have the valve you require. Be sure to order online with Aceparts for a hassle free, money saving experience.