AQUATEK 3-in-1 CO2 Diffuser &Bubble Counter Check Valve (Small)
Extra fine ceramic micro bubble diffuser plate.Compact design enables optimal CO2 diffusion.Provides an accurate measurement of the CO2 flow rate.Check valve protects the gas system and air pump equipment from back-siphoning damage.Prevents flooding during power outage.Two different sizes: small diffuser (R-125) accommodates up to 20 gallon tank and larger diffuser (R-126) accommodates for 20+ gallon tank.