Watco Manufacturing FLEX170-LT-PVC-CP 17-Inch PVC WatcoFlex Flexible Pipe Bath Waste, Chrome Plated Thread size: 1-1/2-Inch - 11-1/2 NPSM (coarse thread), 1.865-Inch major diameter (outside thread diameter), 11.5 threads per Inch Manufactured in compliance with ASME A112.18.2-2005/ CSA B125.2-05; and IAPMO PS 69-2006 No solvent weld No screws to handle, install, or lose No damage from errant screwdrivers