The invention includes a device, kit, and system capable of manually distending a subject’s body cavity. In one embodiment, the invention includes a distention media reservoir (10), insertable member (20) for insertion into a body cavity, and a manually operated pumping member (12) capable of displacing distention media from the reservoir and into a body cavity. In some embodiments, the distention media reservoir may be air or CO2. In one embodiment, the invention is available in the form of a kit. In another embodiment, the devices include a reusable portion and a consumable portion. The reusable portion may include the media distention reservoir and pumping member, the consumable portion includes the insertable member, and may also include a barrier for preventing effluent from contaminating the reusable. In other embodiments, the device is adapted to function as a distention media booster pump that may be used in conjunction with an electro-pneumatic insufflation system.