Dish wash machines generally come in 2 type - Under Counter and Pass Through or aka Hooded Dishwashers. These units can take different size rack from 435mm to 500mm. Please note that most units these days have Rinse and Drain pumps though not all makes and models. If you are on tank water for example then you really should have unit with Rinse pump as water pressure is generally lower on tank water. Drain pumps are mainly useful when the waste out machine is lower than drain where installed. Please contact us and we can go into greater detail and options with you.