Hand Rail Stabilizing Plug 1.875 Inch Carbon Fiber SR Smith Legacy SP Standard Height Long Reach Setback SR Frame Colors Sand Surface Colors The domed SuperFlow main drain The domed SuperFlow main drain grating is unique since it has the capability to maintain a flow rate of 816 GPM (18 x 18 inches) The 8 Foot Frontier II diving board in taupe with white anti slip treads is designed for residential pools with light to moderate use rounds and strengthens the hand rail end so it can be anchored securely Anchor type hand rails are often crushed at the end by the underground anchor causing the hand rail to loosen and become unstable