Thunderbird roof drains are made of superior long lasting copper. All Thunderbird Roof Drains Feature the following: The original seamless drain basin made of long lasting 20oz copper;
Bead blasted for excellent adhesion; Sweat soldered 2", 3", or 4" No Hub adaptor or 2" male thread adaptor; Heavy duty ABS CYCLOLAC Dome Strainer; All roof drains are available with built in overflows, separate overflows are also available. Roof drains are available with optional gravel stop.