Check the listing for details. 4" Round Air Stone Disc Diffuser Hydroponic Aquaponic Growing System. Condition: New. Listed at 8.99 USD. Store Home HOT sale New Products Feedback Add to Favorites Contact us 4" Round Air Stone Disc Diffuser Hydroponic Aquaponic Growing System This 4" Air Stones work with an air pump to create scores of tiny bubbles, adding much-needed oxygen to the water in aquariums, hydroponic and aquaponic growing systems. The larger surface area of the air stone allows for the production of a greater number of these bubbles, therefore increasing the surface area of the oxygen available to your fish or plants. As the bubbles aerate the water, they also help circulate hydroponic nutrients, invigorating the roots of plants and boosting healthy growth. 4" air stone disc Fits ¼" tubing Aerates water Can be used in aquariums or hydroponic systems Durable construction Payment Policy PayPal Prefer. Payment is expected within 7 days of auction close. Unpaid Items will be forfeited per eBay policies. California residents need to pay 7.75% for sales tax. Shipping Policy Please allow 1 to 2 business day after payment is received to process your order shipping All goods guaranteed to arrive in Brand new factory fresh and perfect working condition. No pickups or will-call All tracking numbers will be sent directly to your registered email address (PayPal, eBay, 3rd party) by the automated FedEx system or USPS system AK, HI, GU, VI, PR ship via USPS, fees may extra. Please see below shipping cost table or contact us for shipping quote first before buying. Returns Policy All sales are final unless they are found to be damaged by shipping carrier or our listing error and mistake. We must be notified of the situation within 3 days of your receipt. All items come with 30 days store warranty unless advertised differently. We recommend you check your item right after you receive it. Even you are not attempt to use it in recently. Your only have 30-days warranty no excuse no exception. A 15% restocking fee will be applied to all returns for refund. No refund after 30 days. Under NO circumstances will any shipping and processing fees be refunded. No returns will be accepted if the original packaging is damaged and/or missing accessories. Buyer is responsible for all return shipping charge Return Procedures Please contact us by eBay's "contact member" to obtain a Return Merchandise Authorization (RMA) number. Merchandise should be carefully packed to prevent any losses or damages in transit. Merchandise must be sent back in the original packaging with the original packing slip and displaying the appropriate RMA number. If package return with unfair or damage packing style, it will not be accepted (will take photo if need it). All RMA numbers are valid for ten (10) days from their original date of issue. Returned packages not displaying an RMA number or displaying an invalid or expired RMA number, will not be accepted. Hipro Power is not responsible for any merchandise that is not returned in accordance with the following terms: Listing and template services provided by inkFrog