Comparison : Item # 01-06-7109, Male Pipe Solid Square Head Plug
Item # 01-08-7109, Male Pipe Solid Square Head Plug
Item # 01-12-7109, Male Pipe Solid Square Head Plug
Item # 7109-16-1, Male Pipe Solid Square Head Plug
Item # 7109-20-1, Male Pipe Solid Square Head Plug