These fine bubble airstone discs have foam feet to reduce vibration from compressors and are perfect for smaller koi ponds, aquariums and fish ponds. Also ideal for hydroponic growing stations as the micro-pore design energizes the hydroponic environment and promotes exceptional growth. The 4" air stone disc has a 1/4" barbed hose outlet to attach to 1/4" airline. The 6" and 8" air stone discs have a 3/8" barbed hose connector to attach to 3/8" tubing. Recommended airflow range is from 0.2 to 0.6 CFM (cubic feet per minute).
Airflow recommended per airstone disc