Ultra Reef over flow outlets and Returns which fit on the back or side panel of your aquarium instead of having an internal weir box this buys you more space in the main tank. These allow you to take water from your main aquarium and drain it to a sump.... 1 sizes available for both drain and returns which are bought separate... So you need to buy 1 x drain and 1 x return or you can mix and match with 2 drains and one return or 2 returns and 3 drains the choice is yours...
Drains Large (exits)require a 53mm hole drilled
Returns Large require a 53mm hole drilled in your tank recommended pump 3000- 6000 litres hr
Return Large is 25mm soft pipe
