This Westbrass polypropylene insert style, twist and close bath waste assembly uses polypropylene ferrules and slip joint nuts, to easily conform to tub overflows of varying sizes. Insert style drain makes assembly a snap. Do not use plumber's putty for installation use silicone seal use silicone seal. Comes with overflow faceplate and stopper. Available in a variety of stylish finishes, this item is sure to complement your existing fixtures. Westbrass Fine Decorative Plumbing since 1935.