An apparatus comprising: a manifold body including a central cavity, an output port, a first fluid port, and a second fluid port; a valve stem, adapted to slidably engage the central cavity, the valve stem including: a single central longitudinal fluid passage connected to an injector port; characterized in that, the apparatus includes a first perpendicular fluid passage intersecting the central longitudinal fluid passage to selectively provide fluidic transport between the central longitudinal fluid passage and the output port when the valve stem is in a second rotational position; and a second perpendicular fluid passage intersecting the central longitudinal fluid passage to selectively provide fluidic transport between the central longitudinal fluid passage and a selected one of the first and second fluid ports, fluidic transport to the first fluid port is provided when the valve stem is in a first rotational position and fluidic transport to the second fluid port is provided when the valve stem is in a third rotational position; and wherein a proximal portion of the valve stem is adapted to enable selective rotation of the valve stem within the central cavity to rotatably selectively provide fluidic transport between the central longitudinal fluid passage and one of the first fluid port, the second fluid port, and the output port. wherein the manifold body includes a self-biasing mechanism to positively position the valve stem in the first, the second, or the third rotational position, the self-biasing mechanism including: a plurality of detent cavities positioned in each of the first, second, and third rotational positions; a detent ball configured to inhibit rotational movement of the valve stem when positioned within one of the detent cavities; and a detent bias member configured to press the detent ball into one of the detent cavities. a manifold body including a central cavity, an output port, a first fluid port, and a second fluid port; a valve stem, adapted to slidably engage the central cavity, the valve stem including: a single central longitudinal fluid passage connected to an injector port; characterized in that, the apparatus includes a first perpendicular fluid passage intersecting the central longitudinal fluid passage to selectively provide fluidic transport between the central longitudinal fluid passage and the output port when the valve stem is in a second rotational position; and a second perpendicular fluid passage intersecting the central longitudinal fluid passage to selectively provide fluidic transport between the central longitudinal fluid passage and a selected one of the first and second fluid ports, fluidic transport to the first fluid port is provided when the valve stem is in a first rotational position and fluidic transport to the second fluid port is provided when the valve stem is in a third rotational position; and wherein a proximal portion of the valve stem is adapted to enable selective rotation of the valve stem within the central cavity to rotatably selectively provide fluidic transport between the central longitudinal fluid passage and one of the first fluid port, the second fluid port, and the output port. a single central longitudinal fluid passage connected to an injector port; characterized in that, the apparatus includes a first perpendicular fluid passage intersecting the central longitudinal fluid passage to selectively provide fluidic transport between the central longitudinal fluid passage and the output port when the valve stem is in a second rotational position; and a second perpendicular fluid passage intersecting the central longitudinal fluid passage to selectively provide fluidic transport between the central longitudinal fluid passage and a selected one of the first and second fluid ports, fluidic transport to the first fluid port is provided when the valve stem is in a first rotational position and fluidic transport to the second fluid port is provided when the valve stem is in a third rotational position; and wherein a proximal portion of the valve stem is adapted to enable selective rotation of the valve stem within the central cavity to rotatably selectively provide fluidic transport between the central longitudinal fluid passage and one of the first fluid port, the second fluid port, and the output port. wherein the manifold body includes a self-biasing mechanism to positively position the valve stem in the first, the second, or the third rotational position, the self-biasing mechanism including: a plurality of detent cavities positioned in each of the first, second, and third rotational positions; a detent ball configured to inhibit rotational movement of the valve stem when positioned within one of the detent cavities; and a detent bias member configured to press the detent ball into one of the detent cavities. a plurality of detent cavities positioned in each of the first, second, and third rotational positions; a detent ball configured to inhibit rotational movement of the valve stem when positioned within one of the detent cavities; and a detent bias member configured to press the detent ball into one of the detent cavities.