Marina Extendable Air Stone for Aquariums, 10" - 12 count Hydrometer and Thermometer (12 count counter box REFILL)

(12 count counter box REFILL) This is a bulk box

Essentially

Marinas Battery Operated Air Pumps provide auxiliary air if your main air source fails to operate

fitting an opening up to 41

The active ingredient in 256

Marina Extendable Air Stone for Aquariums, 10" - 12 count Hydrometer and Thermometer (12 count counter box REFILL)The Marina Extendable Airstone is a durable air stone that diffuses water in every direction, creating a dazzling underwater scene. Increases surface agitation, accelerates oxygen replenishment and helps release carbon dioxide build up. Extendable air stone for aquarium use Aerates, circulates and decorates Add more than one in line for spectacular results Attach more than one together for stunning bubble walls. Fits standard airline tubing. Note: