Hygger Aquarium Air Stone Can Create A Great Deal Of Tiny Bubbles That Your Fish Will Love Ideal For Freshwater, Saltwater Aquariums, Hydroponic, Or In Aqua Farms, Aqua Cultures, Create Amazing Beautiful Scenes Under Water Eatures: 1 The Surface Is Frosted, Fine And Smooth, And The Air Is More Evenly And Fine 2T-Type Interface Makes The Air Plate Closer To The Bottom Of The Fish Tank, And The Air Is Smooth 3Regulating Valve: Control The Rotating Plug To Adjust The Size Of The Airflow 4 Nanomaterials Are Not Easily Dissolved, Are Durable And Have A Service Life Of 2 To 3 Years 5 Venting Evenly, Fine Bubbles, High Dissolved Oxygen Rate, Super Quiet 6 Easy To Clean, Exquisite Workmanship, Suitable For Fresh Water And Salt Water Note: 1 Long-Term Use, If The Dirt Is Blocked, When The Air Bubbles Are Reduced, It Can Be Taken Out And Washed Repeatedly 2 It Is Better To Soak In The Bathtub For Two Hours Before Use 3 If The Water Depth Exceeds 40Cm, The Power Can Be Increased As Appropriate 2 Inches Specification: Sizes: 14 Inches - Weight: 18Ounces51Grams - Exit Size: 4Mm Hoses - Compatible Air Pump Power: 1W Or Higher Power Air Pump 2 Inches Specification: Sizes: 2 Inches - Weight: 52 Ounces 150 Grams - Exit Size: 4Mm Hoses - Compatible Air Pump Power: 2W Or Higher Power Air Pump 4 Inches Specification: Sizes: 4 Inches - Weight: 152 Ounces 430 Grams - Exit Size: 4Mm Or 8Mm Hoses - Compatible Air Pump Power: 4W Or Higher Power Air Pump After-Sales Warranty: 1 One Year Free Warranty (Just Contact Us) 2 Free Replacement Within Three Months