Welded fencing system with prefabricated connectors

A fitting comprising:

• a tubular sleeve body formed with a hollow inner space void of inner structure and formed with a uniform wall thickness, with an inner diameter sized to coaxially fit over a pipe member of a predetermined size;
• wherein the sleeve body has a first distal end and a second distal end spaced apart from the first distal end in a longitudinal direction;
• wherein the inner diameter remains constant from the first distal end to the second distal end;
• wherein an edge of the sleeve body at the first distal end has two first distal end protruding rounded tabs and two first distal end recesses, the two first distal end protruding rounded tabs protruding farther than the two first distal end recesses in the longitudinal direction, the two first distal end protruding tabs being diametrically opposed to each other in a radial direction of the sleeve body, and the two first distal end recesses being diametrically opposed to each other in the radial direction of the sleeve body, such that the two first distal end protruding tabs and the two first distal end recesses are arranged alternately around a circumferential direction of the sleeve body;
• and
• wherein an edge of the sleeve body at the second distal end has two second distal end protruding rounded tabs and two second distal end recesses, the two second distal end protruding rounded tabs protrude farther than the two second distal end recesses in the longitudinal direction, the two second distal end protruding tabs being diametrically opposed to each other in a radial direction of the sleeve body, and the two second distal end recesses being diametrically opposed to each other in the radial direction of the sleeve body, such that the two second distal end protruding tabs and the two second distal end recesses are arranged alternately around the circumferential direction of the sleeve body.