A shower unit for an aircraft comprises: a shower head, and controls to manually control the water output. A shower enclosure defines a receiving cavity to receive the user. The shower enclosure supports the shower head and the controls for the user to shower in the receiving cavity. The shower enclosure comprises a first door on a first side of the shower enclosure, and a second door on a second side of the shower enclosure to define a passageway through the shower enclosure. The shower unit is adapted to be positioned in the aircraft such that the passageway communicates between two separate zones of the aircraft.