A fitting (10A, 10B) comprising: a body comprising: an interior surface that includes a first bore extending from a first end of the body and a second bore extending from a second end of the body, wherein the first end of the body defines an inflow port coaxial with an outflow port defined by the second end of the body; and an exterior surface that includes a quick disconnect profile at the first end and an external thread at the second end; the fitting being characterized in that it comprises: a pin disposed within the second bore, the pin comprising: a first portion having a rotationally symmetric profile about a longitudinal axis of the pin that extends towards the first bore; a second portion adjacent to the first portion and between the first portion and the second end of the body, an outer periphery of the second portion engaging the interior surface at the second bore; and a plurality of bypass passages circumferentially distributed about the longitudinal axis and extending through the second portion of the pin; and an adjustment member disposed within the first bore, the adjustment member comprising a cylindrical body and a third bore concentric with an outer periphery of the cylindrical body and extending through the cylindrical body; wherein the second bore and the bypass passages bound a passage extending through the fitting; and wherein a minimum cross-sectional area (Amin) of the passage coincides with the first portion of the pin, wherein an axial position of the adjustment member is variable to vary the minimum cross-sectional area (Amin) of the passage defined between the first portion of the pin and the third bore. a body comprising: an interior surface that includes a first bore extending from a first end of the body and a second bore extending from a second end of the body, wherein the first end of the body defines an inflow port coaxial with an outflow port defined by the second end of the body; and an exterior surface that includes a quick disconnect profile at the first end and an external thread at the second end; the fitting being characterized in that it comprises: an interior surface that includes a first bore extending from a first end of the body and a second bore extending from a second end of the body, wherein the first end of the body defines an inflow port coaxial with an outflow port defined by the second end of the body; and an exterior surface that includes a quick disconnect profile at the first end and an external thread at the second end; the fitting being characterized in that it comprises: a pin disposed within the second bore, the pin comprising: a first portion having a rotationally symmetric profile about a longitudinal axis of the pin that extends towards the first bore; a second portion adjacent to the first portion and between the first portion and the second end of the body, an outer periphery of the second portion engaging the interior surface at the second bore; and a plurality of bypass passages circumferentially distributed about the longitudinal axis and extending through the second portion of the pin; and a first portion having a rotationally symmetric profile about a longitudinal axis of the pin that extends towards the first bore; a second portion adjacent to the first portion and between the first portion and the second end of the body, an outer periphery of the second portion engaging the interior surface at the second bore; and a plurality of bypass passages circumferentially distributed about the longitudinal axis and extending through the second portion of the pin; and an adjustment member disposed within the first bore, the adjustment member comprising a cylindrical body and a third bore concentric with an outer periphery of the cylindrical body and extending through the cylindrical body; wherein the second bore and the bypass passages bound a passage extending through the fitting; and wherein a minimum cross-sectional area (Amin) of the passage coincides with the first portion of the pin, wherein an axial position of the adjustment member is variable to vary the minimum cross-sectional area (Amin) of the passage defined between the first portion of the pin and the third bore.