Tube assembly provided with a breakaway plug

A tube assembly with a breakaway plug of a relatively rigid material comprising:

• a tubular body having at least two open ends at least one of said ends having an end surface and an outer surface portion;
• and
• a plug member having an open end and a closed end, said plug member being mounted on said one open end of said tubular body,
• said plug member including on its inner surface;
• an inner closing surface closing off said closed end,
• a first inner-wall portion extending from the open end toward the closed end a predetermined distance, said first inner-wall portion being fixedly secured to said one open end of said tubular body, and
• a second inner-wall portion extending from the first inner-wall portion to the closed end to define a space between the plug member and the tubular body, said space including two portions:
• a first space portion extending circumferentially between the second inner-wall portion of said plug member and the outer surface portion of the open end of said tubular body, and
• a second space portion extending between said inner closing surface of the plug member and the end surface of the open end of said tubular body,
• said plug member including on its outer surface a thin-walled frangible portion, which is breakable to allow separation of said plug member from said tubular body, said thin-walled frangible portion being located on the outer surface of said second inner-wall portion and located radially outside said first space portion, said one open end of the tubular body extending in said space beyond the thin-walled frangible portion toward the closed end of the plug member.