Abstract: A compact, self-contained servicing apparatus for onboard lavatories on private aircraft and other vehicles comprises a reservoir container with a lid coupled to a flexible hose bearing a standard lavatory clean-out coupling on its opposite end. The coupling mates with a clean-out port beneath the lavatory of the vehicle. The hose permits contents of the onboard lavatory to flow under gravity into the container. The device includes a rinse bucket for pouring rinse water through the lavatory and for refilling the lavatory with disinfect and fluid. The device also optionally contains gloves, goggles, towels and other supplies used in the self-service process, and a second lid seals the container for transporting lavatory effluent to a disposal area. In one embodiment, the components of the apparatus nest within the container to form a service kit that stores onboard the vehicle when it is not in use.