A dishwasher having a tub, a sump fluidly coupled to the tub, a discharge outlet, a drain assembly, and a check valve drain assembly including a seat assembly having a body with a first distal end and a second distal end, a fluid passage extending through the body, the body defining a valve seat having a sealing surface about the fluid passage and a flapper assembly operably coupled to the seat assembly and having a moveable portion configured to selectively move between a closed position where the moveable portion seals against the sealing surface and an opened position where the moveable portion raises to allow liquid through the fluid passage.