A medical device comprising: a device body and an insufflation fitting coupled to and extending from the device body; the insufflation fitting comprising an annular high-flow fitting portion extending away from the device body, an annular low-flow fitting portion extending away from the annular high-flow fitting portion, and a single flow passageway, the single flow passageway defining a flow path for insufflation gas through the insufflation fitting into the device body; the annular high-flow fitting portion comprising: a first inner surface; a radially outward sealing surface generally reverse from the first inner surface; a second radially outer surface offset axially from the radially outward sealing surface toward the device body; and a coupling portion on the second radially outer surface; the annular low-flow fitting portion comprising: an inner sealing surface; a first radially outward surface generally reverse from the inner sealing surface; and a coupling portion on the first radially outer surface; the first inner surface of the annular high-flow fitting portion and the inner sealing surface of the annular low-flow fitting portion defining the single flow passageway; a low-flow connector comprising a radially outer male sealing surface configured for sealing engagement with the inner sealing surface; and a high-flow connector configured to surround the annular low-flow fitting portion and comprising an inner female sealing surface configured for sealing engagement with the radially outward sealing surface of the annular high-flow fitting portion. a device body and an insufflation fitting coupled to and extending from the device body; the insufflation fitting comprising an annular high-flow fitting portion extending away from the device body, an annular low-flow fitting portion extending away from the annular high-flow fitting portion, and a single flow passageway, the single flow passageway defining a flow path for insufflation gas through the insufflation fitting into the device body; the annular high-flow fitting portion comprising: a first inner surface; a radially outward sealing surface generally reverse from the first inner surface; a second radially outer surface offset axially from the radially outward sealing surface toward the device body; and a coupling portion on the second radially outer surface; a first inner surface; a radially outward sealing surface generally reverse from the first inner surface; a second radially outer surface offset axially from the radially outward sealing surface toward the device body; and a coupling portion on the second radially outer surface; the annular low-flow fitting portion comprising: an inner sealing surface; a first radially outward surface generally reverse from the inner sealing surface; and a coupling portion on the first radially outer surface; an inner sealing surface; a first radially outward surface generally reverse from the inner sealing surface; and a coupling portion on the first radially outer surface; the first inner surface of the annular high-flow fitting portion and the inner sealing surface of the annular low-flow fitting portion defining the single flow passageway; a low-flow connector comprising a radially outer male sealing surface configured for sealing engagement with the inner sealing surface; and a high-flow connector configured to surround the annular low-flow fitting portion and comprising an inner female sealing surface configured for sealing engagement with the radially outward sealing surface of the annular high-flow fitting portion.