Floor/wall: 394 GPM at 1.5 fps - Open area: 84 square inch For single or multiple drain use 3" minimum sump depth (see installation instructions). Retrofit adapter frame easily and safely retrofits most brands existing 9" mud frame with epoxy or screws or both; cover anchors into in-molded brass inserts in frame with four fine thread machine screws ideal for retrofitting over all existing sumps/frames up to 13" by anchoring directly into pool finish (plaster, tile, fiberglass, etc.) using four brass anchors and stainless screws in kit #BIK4 5 Year Life from the Date of Installation All AquaStar® covers are trademarked VGB. Compliance button can easily be identified as VGB compliant on the cover from on deck and underwater. They are also manufactured from superior UV-resistant engineered polymers and all components (cover, sump and screws) meet or exceed ANSI/APSP 16-2011 and NFS/ANSI 50-2009a national standards and ASTM G154 UV testing exposure.