The XS Scuba 30lb wing you purchased last year has a hose assembly that attaches like the majority have for many years.
The female outlet on the bladder has square cuts all the way around the perimeter of the opening.
The male end of the bcd hose has square cuts all the way around the perimeter of the hose as well. These mate squarely with the cuts in the female outlet. These allow you to adjust the angle of the hose and to keep it secure when you tighten it down. You may need to loosen the nut turn the hose one way or the other to get the alignment of the hose that is most comfortable for you as it comes over your shoulder.
To assemble......put the gasket in the female outlet......carefully start threading the outer nut of the male connector onto the female outlet connector. Gently push down on the hose as you tighten the nut and you will feel the square cuts in the male and female outlets align. Continue to tighten down the outer nut until it is hand tight. The nut on this hose nut is easy to grip and should be hand tightened only. Do not use wrenches or pliars or you will damage it.
When the outlet nut is hand tight, inflate the bladder and check the alignment of the hose as it goes over your shoulder.....If adjustment of the angle is needed, deflate the bladder, loosen the outlet nut all the way, rotate the outlet and tighten again as you did the first time. It may take some trial and error to get it exactly the way you want it.
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Doing it right should include some common sense, not just blindly following specs and instructions. .Gary D, AWAP on SB