An insert for use with a beverage dispenser having a base fluid module (20, 120) and an additive fluid manifold (40, 140) positioned around the base fluid module (20, 120), the base fluid module (20, 120) having a chamber, a first conduit through which a first base fluid is conveyed into the chamber, and a second conduit through which a second base fluid is conveyed into the chamber, the additive fluid manifold (40, 140) having an inlet that receives an additive fluid and an outlet (144, 144') that dispenses the additive fluid, the insert comprising: - a diffuser having an upstream end configured to be inserted into the chamber and to receive the first base fluid, a downstream end with an outlet configured to dispense the first base fluid, and a center bore extending between the upstream end and the downstream end along an axis, wherein the upstream end of the diffuser has a plurality of holes through which the first base fluid is conveyed such that pressure of the first base fluid is reduced and the downstream end of the diffuser has a radially outer edge, and wherein the outlet of the diffuser is an annular outlet that extends along the radially outer edge such that the first base fluid radially outwardly dispenses from the annular outlet; and - a stem disposed in the center bore and having a first end configured to be coupled to the second conduit to thereby receive the second base fluid from the second conduit and an opposite second end with an outlet configured to dispense the second base fluid, wherein the outlet of the diffuser is upstream from the outlet of the stem such that the first base fluid dispensed from the outlet of the diffuser mixes with the additive fluid before the second base fluid dispensed from the outlet of the stem mixes with the additive fluid, characterized in that the diffuser has a shoulder member positioned between the upstream end and the downstream end of the diffuser, the shoulder member has a radially outer perimeter and a plurality of cutouts positioned along the radially outer perimeter and extending through the shoulder member; and wherein the first base fluid conveyed through the plurality of holes is dispensed onto the shoulder member and is thereby radially outwardly diffused and conveyed through the plurality of cutouts. - a diffuser having an upstream end configured to be inserted into the chamber and to receive the first base fluid, a downstream end with an outlet configured to dispense the first base fluid, and a center bore extending between the upstream end and the downstream end along an axis, wherein the upstream end of the diffuser has a plurality of holes through which the first base fluid is conveyed such that pressure of the first base fluid is reduced and the downstream end of the diffuser has a radially outer edge, and wherein the outlet of the diffuser is an annular outlet that extends along the radially outer edge such that the first base fluid radially outwardly dispenses from the annular outlet; and - a stem disposed in the center bore and having a first end configured to be coupled to the second conduit to thereby receive the second base fluid from the second conduit and an opposite second end with an outlet configured to dispense the second base fluid, wherein the outlet of the diffuser is upstream from the outlet of the stem such that the first base fluid dispensed from the outlet of the diffuser mixes with the additive fluid before the second base fluid dispensed from the outlet of the stem mixes with the additive fluid, characterized in that the diffuser has a shoulder member positioned between the upstream end and the downstream end of the diffuser, the shoulder member has a radially outer perimeter and a plurality of cutouts positioned along the radially outer perimeter and extending through the shoulder member; and wherein the first base fluid conveyed through the plurality of holes is dispensed onto the shoulder member and is thereby radially outwardly diffused and conveyed through the plurality of cutouts.