4 pcs 1.5” Air Stones: Suitable for hydroponic systems, ponds, aquarium fish tanks, helping extend the life of your nutrient solution, keep fish/ roots healthy and promote plant growth
Package Contains: 1 air pump and 4 pieces of 1.5-inch air stones.
Powerful: total output 300GPH; 4 outlets make it easy to run multiple sponge filters, air stones, bubbler decorations and air bubble discs
Dimension of Air Pump: 7.5x5.5x3.5 inches (L x W x H)
Adjustable Airflow: a control knob allows you regulate the air flow as needed