FIG. 1 is a top view of a coupling for pipes, hollow cylindrical structure, showing my new design;
FIG. 2 is a perspective view thereof;
FIG. 3 is an front view thereof;
FIG. 4 is a front view of a coupling for pipes, reducing coupling, showing my new design;
FIG. 5 is a top view thereof;
FIG. 6 is a perspective view thereof;
FIG. 7 is a perspective view of a coupling for pipes, hollow cylindrical structure with both ends identical, showing my new design;
FIG. 8 is a front view thereof;
FIG. 9 is a front view of a coupling for pipes, hollow cylindrical structure with both ends identical, showing my new design; and,
FIG. 10 is a perspective view thereof.
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