TPO Clad Stainless Steel Bottom Outlet Roof Drain with seamless flashing and drain basin. Heat weld TPO membrane directly to the drain flashing. Comes with strong ABS Cyclolac dome strainer. 2", 3", 4", and 6" sizes available. * Seamless Basin * TPO Clad Stainless Steel Drain * 2", 3", 4", or 6" bronze fitting. * Heavy duty ABS Cyclolac dome strainer * 10" diameter basin * Heat weld directly to the TPO clad drain flashing * Manufactured in the USA by Thunderbird Products * This item is also available with optional overflow * This item is also available in Copper, Stainless Steel, and PVC Clad Note on Fittings: Two types of fittings are available. A threaded adapter fitting is used primarily with 2" PVC pipe applications. The threads on the bronze fittings are male and can be attached to a threaded female PVC adapter. A no hub fitting is the standard fitting used in the industry. With this fitting a rubber coupling is used to connect the drain to the drainage pipe.