This is a reproduction of an MG Valve Cover Oil Filler Cap as used on MGB 1971-1980 and MG Midget and Austin Healey Sprite from 1963-1974 using a non-vented cap. This is a non-vented cap. These will also fit the valve cover for the 1965-1970 MGB which originally used a vented cap. Make sure you need a non-vented cap before ordering as many cars have had the valve cover and breather system alter or changed over the years.