AquaStar Square Anti-Entrapment Suction Outlet Cover 16" for 12" Square Retrofit Floor/wall: 472.2 GPM at 1.5 fps - Open area: 101 square inch Single – 3" 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.