Available at: http://www.set-rite.com - The Only Code Approved Extender and Toilet Flange Spacer System, that provides a Water & Gas Tight Seal for the Best Seat in your home! More Info at: http://www.set-rite.com The Full Extender Kit can be used by DiYers and plumbers alike. The key to a good toilet installation seal is having the flange be at the finished floor height. Although many may think just using an additional wax ring or two (stacking) will work fine. This is not the correct method and could lead to extensive damage to your sub-floor and surrounding structural areas of your home if your toilet begins to leak.. Set-Rite's motto is Set it Once, Set it Right...with Set-Rite. Check out this video to learn how easy it is to install!!