invention various changes and modifications obvious to one skilled in the art to which the invention pertains are deemed to be within the spirit scope and contemplation of the invention as further defined in the appended claims the general valve body and valve neck assembly shown in fig1 is an example of a general arrangement which can be used for pressurized containers such as a keg of beer the valve neck 50 is welded onto the container not shown to form the opening of the container the valve neck 50 is illustrated in greater detail in fig2 the valve neck 50 is of generally cylindrical configuration with an outer surface 52 and an inner surface 54 the upper portion of the valve neck 50 contains a protruding portion 56 an annular groove 58 extends around the entire inner circumferential wall 54 at a location adjacent the protruding portion 56 the annular groove 58 further contains an upper surface 60 and a lower surface 62 also within the area of the annular groove 58 is a keyway 64 the keyway is straight and extends from the top 66 of the valve neck 50 to a distance below the lower surface 62 of annular groove 58 the valve neck 50 also contains a lower inwardly extending surface 72 which extends radially inward to form an internal ring on the lower surface and inward of the interior surface 54 of the valve neck 50 this lower internal surface or ring 72 contains an upper surface 74 also illustrated in fig1 is the valve body 10 for the sake of completeness the entire valve body and associated valves have.