Juwel air diffuser kit turns your pump outlet into a venturi releasing bubbles and oxygenating the aquariumr the diffusor kit fits all juwel pump heads except the 280r you may wish to add even more air to your aquarium this is why juwel have designed the air diffuser to blow a stream of bubbles in your aquariumsimply attach the supplied pieces to the outlet of your pump and you will see an attractive and beneficial flow of air bubbles blowing around your aquariumthese are perfect if you wan