AquaStar Pool Products R8MF105 Main Drain Grate,Retro 8" Round,MoFlow,w/Hardware,Dark Gray8" Round Refrofit MoFlow Suction Cover For single or multiple drain use in existing frames and sumps Easily and safely retrofits most brands' existing 8" frames and sumps that the 8MFxxx does not fit. 3"sump depth, minimum 2" pipe Floor: 146 GPM at 2.9 fps Wall: 130 GPM at 2.6 fps Floor/Wall: 75.3 GPM at 1.5 fps Floor/Wall: 50.2 GPM at 1.0 fps 16.1 square inch opening Replaces RLP8AVxxx Fits: AquaStar “R” 8" models Alloy Brass Foundry (ABF) Afras Splash Sta-Rite Swimquip Caretaker/Polaris Advanced (APP) Hayward Certain Custom Molded Products (CMP). The manufacturer suggests replacing this every five (5) years from the date of installation.