Next, the fitting should be clamped in a vise. Obviously, the jaws of a standard vise will gouge the fitting if no preventative measures are taken. We wrapped our fitting in heavy cloth tape (duct tape will do) before tightening down on it. The fitting should be positioned so the threads protrude from the jaws, allowing you to push the hose against the fitting's nipple. Grip the hose (not the fitting) and push while twisting to engage the threads of the socket with those of the fitting.