HydroSpirit’s Coarse Air Disc offers the ultimate experience in nutrient oxygenation. The fitting is entirely made of durable ABS plastic and consists of six precision engineered coarse output holes that guarantee an anti-clog and efficient air flow. Even when the nutrient solution is extremely depleted, the Coarse Air Disc’s low profile will still supply the essential aeration. Four large suction cups hold the disc firmly in place and thus ensure that the solution is thoroughly aerated from the bottom up - no more "dead spots". The removable red-colored grip offers comfortable handling and adds visibility in black reservoirs. Size is 5" in diameter and ½" height.