A product comprising: a valve for use with an internal combustion engine exhaust breathing system comprising: a body defining a first port having a first interior surface and extending from a first inlet and to a first outlet, the body defining a second port having a second interior surface and extending from a second inlet and to a second outlet, a partition located between the first port and the second port in order to separate the first port and the second port, the partition defining an opening; and a plate being dimensioned to seat within the opening, the plate selectively rotating between a first position where fluid flows from the first inlet, through the first port, and out the first outlet, and where fluid flows from the second inlet, through the second port, and out of the second outlet, and a second position where fluid flows from the first inlet, through a portion of the first port, through a portion of the opening, through a portion of the second port, and out the second outlet, characterised in that, when the plate is in the first position, the plate is seated against a peripheral rim of the opening, and wherein, when the plate is in the second position, the plate is seated partly against the first interior surface and partly against the second interior surface. a valve for use with an internal combustion engine exhaust breathing system comprising: a body defining a first port having a first interior surface and extending from a first inlet and to a first outlet, the body defining a second port having a second interior surface and extending from a second inlet and to a second outlet, a partition located between the first port and the second port in order to separate the first port and the second port, the partition defining an opening; and a plate being dimensioned to seat within the opening, the plate selectively rotating between a first position where fluid flows from the first inlet, through the first port, and out the first outlet, and where fluid flows from the second inlet, through the second port, and out of the second outlet, and a second position where fluid flows from the first inlet, through a portion of the first port, through a portion of the opening, through a portion of the second port, and out the second outlet, characterised in that, when the plate is in the first position, the plate is seated against a peripheral rim of the opening, and wherein, when the plate is in the second position, the plate is seated partly against the first interior surface and partly against the second interior surface. a body defining a first port having a first interior surface and extending from a first inlet and to a first outlet, the body defining a second port having a second interior surface and extending from a second inlet and to a second outlet, a partition located between the first port and the second port in order to separate the first port and the second port, the partition defining an opening; and a plate being dimensioned to seat within the opening, the plate selectively rotating between a first position where fluid flows from the first inlet, through the first port, and out the first outlet, and where fluid flows from the second inlet, through the second port, and out of the second outlet, and a second position where fluid flows from the first inlet, through a portion of the first port, through a portion of the opening, through a portion of the second port, and out the second outlet, characterised in that, when the plate is in the first position, the plate is seated against a peripheral rim of the opening, and wherein, when the plate is in the second position, the plate is seated partly against the first interior surface and partly against the second interior surface.