A medical valve has a first housing portion and a second housing portion capable of mating with the first housing portion to form an interior. The medical valve also has a valving element within the interior. The first and second housing portions have mating longitudinal snap-fit structures for longitudinally mating the first housing portion to the second housing portion. The first and second housing portions also have mating rotational snap-fit structures for substantially preventing the first housing portion from rotating relative to the second housing portion when the longitudinal snap fit structures are mated.