HOCTRAKA 4 Pieces 4 Inch Air Stone Disc Bubbler Diffuser with 12 Pieces Suction Cups for Aquarium Hydroponics Fish Tank Air Pump Round Aquarium Air Stone Kit

[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] -- 4" D x 0.75" H, 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 pump), standard pressure is 0.01 MPa, max pressure is 0.012 MPa [Safe materials and size] -- Made of quality and non-toxic mineral material with high temperature sintering process, these air stone bubblers are sturdy and durable; They can produce fine bubbles for oxygen replacement and lower CO2 levels, safe for fishes to live in. [Versatile and widely applicable] -- The aerator diffuser is suitable for hydroponic systems, ponds, aquariums, fish tanks and other systems, helping extend the life of your nutrient solution, keep fish/ roots healthy and promote plant growth [Note] -- The bubble diffuser disc can be soaked for 2 hours before being applied for the first time and the hose connected to the air pump can be repeatedly plugged and unplugged more than 4 times, which can help the air bubbles to be more uniform, clean regularly by a brush as they get clogged after weeks or months of usage. The stones are available in blue and black. The styles are sent randomly