The Sure Flow increase the gph of the Maxi-Jet 400, Maxi-Jet 600, Maxi-Jet 900 & Maxi-Jet 1200 powerheads. With the Sure Flow, the Maxi-Jet 1200 will put out 1600 gph. See Photo of Sure Flow Installation (new window).Includes:shroud cappropeller/magnet assemblyfull rotation bracket for Sure Grip magnet holder or suction cup bracketPump and Sure Grip not included.Benefits:Excellent water movement for reef tanksWorks with Sure Grip magnet holdersWorks with original Maxi-Jet brackets (NOTE: super glue required to attach bracket)Fish love the extra water movementFully adjustable flow directionNice, wide gentle water flowNo more dead spotsVery cost effective