Culwell PC4 Premium Property Saving Toilet Flange with PVC Surface Seal Compression and White/Blue Ring, 4-Inch Flat sealing surface that sits flush & seals to the floor, preventing leaks and water damage to the subfloor Easy drop fit into 4" cast iron or schedule 40 DWV- replacement flange- mechanical tighten from finished floor allowing up to 3" compression adjust to riser Blue nylon clamping ring with superior strength and durability- withstands over 500 lb. pullout force from each closet bolt- not need for future repair or replacement Elastomeric sealing gasket(s) 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 D4067 Premium engineered design- commercial/residential- new install, repairs, renovation- Saves thousands of dollars in property repairs Easy drop fit into 4" such 30 cast iron or such 40 DWV- mechanical tighten from finished floor allowing up to 3" compression adjust to riser 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 D4067