This belongs to the PIPE FITTINGS METAL category of parts that follow the ANSI standard for Fittings. Type specification is: HEX HD PIPE PLUG, THRD, IN, ASME B1611. Size specification is: 3. These models are all available in a precise CAD format, accessible to users of Alibre Design. You can use Alibre Design Xpress at no cost for any amount of time, along with the free integrated Alibre 3D Publisher for Google SketchUp. Click the link below to get information on the best value in 3D CAD.