Yeah the new ones I'm building for clones are 4 inch. But the real cool thing is it has an auto waterer. You know when you check your ph and PPM in your rez every day sometimes that water level is low and I add ph corrected water to the rez til I change it out. I set up a pump with a 24volt system to auto magically add the water to the res daily. Its fuckin awesome man. I just sent of for a ph controller that will auto correct my ph by itself if it gets out of bounds. Eliminates some daily work.