The new Eheim Power Diffusor supplies fresh air from the outside whose oxygen content aerates the water uniformly. The supply of oxygen is necessary particularly for sparsely planted aquariums, for cold and sea water tanks or for keeping oxygen-loving fish. Air should be supplied additionally whenever a cover or lighting system limits the headroom over the surface of the water. Otherwise the oxygen available from this area would soon be used up. The new Eheim Power Diffusor is suitable for hoses with the indicated diameter and can be connected directly with the Eheim Installation Kit 2.Eheim Power Diffusor 400365 for Hose 12/16 mm and Installation Kit 2, suitbale for filter 2213, 2222/24, 2322/24Eheim Power Diffusor 400465 for Hose 12/16 mm and 16/22mm and Installation Kit 2, suitbale for filter 2048, 2215/17, 2226/28, 2326/28, 2250Eheim Power Diffusor 400565 for Hose 16/22 mm and Installation Kit 2, suitable for filter 2026/28, 2080, 2126/28, 2180, 2252, 2260The small diffuser is mou