American Standard 7798.0308030 3-Inch Threaded P-Trap Standard
It is an American standard trap with strainer. It has a 3" iron pipe with cleanout plug and strainer .It is mainly used For cast iron service sinks .
From the Manufacturer
American Standard Trap Standard in Chrome, # 7798.020. 3" IPS connections. Strainer included
P-Trap with strainer
Outlet to wall
Threaded 3" inside for cast iron service sinks