4x2 Inch Aerator Diffuser Air Stones - 10pcs for Aquariums Hydroponics ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? Enhance your hydroponic systems, ponds, or aquariums with this versatile Air Stone. Measuring 2 inches in diameter and 4 inches in height, it fits standard 3/16 inch airline tubing. Crafted from safe, non-toxic, and washable materials, it promotes healthy fish, roots, and plant growth while extending the life of your nutrient solution. For optimal performance, pair with a high-output air pump of at least 8W-10W or a commercial-grade model. Prior to use, soak the stone in water for one hour and clean it regularly with a brush. To ensure fast and reliable delivery, we work with multiple fulfillment partners and suppliers. Depending on availability and location, your order may ship from different warehouses or arrive in packaging that varies from item to item. Tracking details are typically provided shortly after shipment, and customer satisfaction remains our top priority. Please note that due to carrier policies and regional regulations, certain items may not be eligible for delivery to specific states or territories. Shipping Free Fast Shipping - We offer free shipping to most of the USA with a normal delivery time of 3-7 days. However, due to the current situation, additional delivery time (up to 3 weeks) may be required for some items. Alternative Carriers - We may use alternative carriers (e.g. USPS, FedEx, UPS, etc.) to ensure your package arrives safely and on time. Due to the use of multiple carriers, we are unable to provide a tracking number automatically. Handling Time - Orders are processed and shipped within 1-2 business days of receiving cleared payment. Shipping Restrictions - Shipping to Alaska, Hawaii, Puerto Rico, Guam, and other US territories may incur shipping charges or delivery restrictions. Please contact us before ordering, or your order can be refunded/cancelled. State Restrictions - There may be restrictions based on your state of purchase. For example, certain items may not be shipped to California due to state regulations. Contact for Tracking Updates - If you require tracking updates or have any concerns about the delivery of your order, please feel free to contact us, and we will be happy to assist you. Return 30-Day Hassle-Free Returns - We want you to be completely satisfied with your purchase. If you are not, you can return the item within 30 days of receiving it for a full refund or exchange. Easy Return Process - To start a return, simply contact us and we will provide you with a prepaid return shipping label and detailed instructions. Restocking Fee - There are no restocking fees for returns. However, the buyer is responsible for return shipping costs if the return is not due to a seller's error. Refund Processing Time - Refunds will be processed within 5 business days of receiving the returned item in its condition. Payment We accept all major credit cards, PayPal, and Apple Pay for your convenience. Your payment information is secure and encrypted to ensure a safe and seamless transaction. Please complete your payment within 3 days of purchase to avoid any delays in shipping. Feedback Your feedback is extremely important to us. We strive to provide the best products and customer service possible. If you are satisfied with your purchase, please take a moment to leave us a positive review. If you have any concerns or issues with your order, please contact us before leaving negative feedback. We are committed to resolving any problems and ensuring your satisfaction. Contact Us If you have any questions or concerns, please feel free to out to our customer support team. You can contact us through the messaging system. We are available Monday to Friday, 9:00 am to 5:00 pm EST, and we will do our best to respond to your inquiry within 24 hours. Buy it now and enjoy a pleasant shopping experience! Unit Quantity: 10.0 count Water Type: All Water Types Tank Capacity: 0.7 gal. Unit Type: Unit