This is an anti vortex main drain grate that is approved for both floor and wall usage. Floor: 100 GPM @ 2.72 FPS Wall: 64 GPM @ 1.73 FPS Life Expectancy: 7 Years Specs: 8" Round Retrofit main drain cover WHITE Center to Center Screw Hole Measurement: 7" Cover Dimensions: Cover Outside Diameter: 7-9/16" (A) (MAIN FLANGE RING) Cover Total Height: 1" (B) Maximum Height Above Main Drain Body: 1" Screw Holes: 2 : 7" Apart Center Line to Center Line Measurement Screws: 2 Screws are included with the cover - #10-32 X 1/2" Machine Threads
