Removable basket with an open/close stopper that seals tightly into Duostrainer body Premium metal construction for durability and reliability KOHLER finishes resist corrosion and tarnishing Requires K-8804 Duostrainer body and tailpiece (sold separately) Premium metal construction for durability and reliability. Fits sinks with standard 3-1/2- or 4-inch outlet. Requires K-8804 Duostrainer body and tailpiece (sold separately).