.Certified by Uniform Plumbing Code (cUPC) Can be installed via Under-Mount (countertop Over edge of sink), Top-Mount (countertop Under edge of sink), or Flush-Mount (countertop Even with sink)It is required to support the sink from beneath regardless of how it is installed. We recommend having the sink on location to trace and measure for countertop and cabinet cut outs. White 36" Smooth Apron Sgl Bowl Fireclay Farm Sink Defective sinks will not pass our quality control inspection and would be recycled into a new sink at the factory.