Culwell PC3 Premium Property Saving Toilet Flange with PVC O-Ring Compression and White/Blue Ring, 3-Inch Premium engineered design- commercial/residential- new install, renovation, remodeling- Saves thousands of dollars in property repairs O-ring compress inside 3" cast iron or schedule 30 or 40 DWV pipe- 2 O-ring options for inside pipe- solid flat head for level fit and surface seal Blue nylon clamping ring with superior strength and durability- lab tested withstanding over 500 lb. pullout force from each closet bolt 2 rubber sealing gaskets w/nylon clamp ring ensures tight seal while securing closet bolts in place- 8 counter sunk screw holes for floor attachment Made in USA - patented -complies NSF/ANSI 14, nylon clamping ring ASTM D4066