Eliminates All Screw; Eliminates Need for Separate Overflow Test Plug; Eliminates Leaks Due to Loose Overflow Attachment; Eliminates Dual Inventory of One and Two-Hole Over-Flow Plate; Includes Built-In Test Membrane; Easily Remove Membrane after Test; Snap-On Overflow Plate 1-1/2"-11-1/2 NPSM Coarse Thread, Schedule 40, Oil Rubbed Bronze, PVC, Solvent Weld Assembly, Push and Pull, Half Kit for Bath Waste