Sizes of Typical Section
Sizes are the same for each fitting.
Elbow Fittings are hollow, and allow passage of cables etc. but T's , 3 way's & 4 ways  have a blocking partition.
 However holes can be drilled in these blocking partition to accommodate cables or air lines.
These Tube joiners are only for 2" x 1/16  and 50 x 50 x 1.6 mm Tube.
The fit into the tube is an interference fit, and requires significant force to insert. Therefore, once fitted, they have to be destroyed to extract them. This also means no extra screws or pop rivets are needed to keep the fitting in place.
Pop rivets or self tapping screws can be used where forces tend to pull the tube of the fittings.

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