Sunsun 2 X 1300 GPH Circulation Pump Wave Maker Aquarium Reef Powerhead with Suction Cup Mount Fully submersible water pumps generate a wide and gentle water flow to breathe life to once, hard-to-access "dead spots" in your aquarium Wide-spread range just like a wishy-washy ocean wave, ideal for marine reef aquariums 360 degree rotation to adjust flow in any direction, articulating ball joints for versatile directions, easy installations Dimensions: 4 1/8" x 3" diameter