JUST SET UP MY 620T WITH EHEIM 2213 EXTERNAL.REMOVED THE POWERHEAD TO GET THE INLET PIPE INTO THE TANK ALSO USED 12MM ELBOW TO PUT THE OUTLET SPRAY BAR INTO THE AQUA ONE FILTER.USED THE AQUA ONE SPRAY BAR AS 16MM PIPE GOES INTO IT TIGHTLY.2 FILTERS FOR THE PRICE OF 1.HOPE THIS HELPS ANYBODY WANTING TO GHANGE TO EXTERNAL WITHOUT MOVING MEDIA.