This 2’x 12’ cylindrical ceramic air stone functions as a high-efficiency bubble diffuser to oxygenate large aquariums, koi ponds, and hydroponic systems. Key FeaturesMaterial: Porous fused ceramic designed to produce exceptionally fine micro-bubbles for maximum oxygen transfer.Design: Heavy-duty cylindrical barrel secured with protective black end caps and an integrated metal airline connector.Application: Ideal for garden ponds, fish quarantine setups, deep water culture (DWC), and large tanks requiring strong circulationSmall: 30 mm wide × 80 mm long (1.2" × 3.1")Medium: 30 mm wide × 105 mm long (1.2" × 4.1")Large: 40 mm wide × 170 mm long (1.6" × 6.7")Extra Large (Most Common): 50 mm wide × 200 mm long (2" × 8")Commercial / Pond: 50 mm wide × 300 mm long (2" × 12")