Check the listing for details. EasyPro EBD4A 4" Heavy Duty Pond Bottom Drain w/ Air Diffuser. Color: Black, Condition: New. Listed at 224.99 USD. EasyPro 4" Heavy Duty Bottom Drain w/ Air Diffuser (MPN EBD4A) 4" EBD4 and EBD4A Features: The popular EBD bottom drain has been redesigned for 2011, and is now available with or without air diffuser Welded FPT threaded inlet eliminates the need for rubber coupling Threaded center stand pipe securely attaches dome lid to base Sixteen stainless screws securely attach liner ring to base with water tight seal Heavy duty, roto-molded design offers superior strength For use with 4" schedule 40 PVC fittings and pipe, use 4" male adapter (MA40) to connect to 4" pipe, use reducing male adapter (RMA4030) to connect to 3" pipe EBD4A incorporates an air diffuser into the dome lid - incoming air is delivered up through the center stand pipe allowing air tubing to be installed under liner EBD4A tubing adapter is 1/2", recommended air flow through diffuser is .5 - 1.5 cfm Webb's eBay Store Store Home Store Policies Feedback Shipping Most orders are shipped from our warehouse in Maryland. We warehouse over 95% of the items that we offer, which is a key to our quick order turn-around. Some orders are drop shipped directly from our manufacturer's in various states within the continental US. All orders are shipped via either UPS or FedEx therefore we cannot deliver to PO boxes, please supply a physical address to which we can ship your order. Payment We accept PayPal and the following credit cards: Visa, MasterCard, American Express, and Discover. Please feel free to call with any questions.