Abstract: A reversible side outlet washing machine box for being mounted between two adjacent studs in a wall and for allowing first and second water supply lines and a drain line to be coupled to the first and second water hoses and drain hose, respectively, of a washing machine. The box includes a first side wall; a second side wall; and a base member having a first and a second end; the base member extends between the first and second side walls and is reversible to allow either the first or second end thereof to be attached to either the first or second side wall; the first water supply line and the first water hose being attachable to the base member adjacent the first end thereof, the second water supply line and the second water hose being attachable to the base member intermediate the first and second ends thereof, the drain line and the drain hose being attachable to the base member adjacent the second end thereof.