Set-Rite - Toilet Flange Extender Kit (1/2" to 5/8") Toilet Flange Repair Extender Kit - Extends from 1/2" to 5/8" to Finished Floor Code Approved - Provides a Water & Gas Tight Seal (IAPMO) Works on Top or Underneath Existing Toilet Flanges Our Extender & Spacers measure 7-1/4" in diameter, just slightly larger than a 7" flange. Use on Cast Iron, Lead Bends, PVC & ABS Flanges or Uneven Surfaces