Mudder 4 Pieces Round Air Stone Disc Hydroponics Pump Bubble Diffuser Release Tool for Aquarium with 12 Pieces Suction Cups Fish Tank Aerator Air Stone KitBrand: Mudder Color: Blue Gray Features: Package includes: 4 pieces of air stone discs and 12 pieces of suction cups, which can hold the air stone in place and prevent it from friction abrasion to increase its lifespan Specification: the jetting volume of bubble diffuser is 12 L min, suitable for approx 24 59 inch fish tank, fits for tube of 3 16 inch and 3 8 inch inner diameter; Recommended air pump power ranges from 4W to 8W (works best with 8W air