Check the listing for details. Aquarium Air Pump for 100 Gallon Fish Tank Adjustable Air Bubbler for Hydroponic. Condition: New. Listed at 12.99 USD. Features: Dual-Outlet design making it convenient to run multiple small air stones, sponge filters, air bubbler decorations, or other bubble ornaments for small fish/shrimp tanks or hydroponic systems.The small aquarium air pump has an adjustable knob, so can adjust the air pressure accordingly without scaring the fish who prefer soft water flow.The fish tank air pump creates a steady stream of air for small a betta tank, brine shrimp hatchery and small hydroponic setup.4 rubber feet at the bottom keep it from sliding around to reduce the noise further. The check valves would protect you air pump by preventing aquarium water from back siphoning during a power outage when your air pump is below the tank water level. Specifications: Recommended Tank Size: 100 gal. Dimension: 4.25x3.5x1.5 inches (L x W x H) Length of power cord: 3.6 ftVoltage: 110V-120V/60Hz Includes: 1x Air Pump 2x 3.3ft Tubing 2x Check Valves 2x 1” Air Stone