Features This flange has an adjustable metal ring which allows for easy toilet alignment and a special closet bolt holding design for easy toilet mounting Solvent welds over 3" Sch. 40 fitting hub Solvent weld joints Pipe Diameters the same as Iron Pipe (IPS=Iron Pipe Size) Meets ASTM D2665 NSF Listed Drain Waste and Vent applications only Specifications Type: 4" x 3"