You might have had the very best of intentions to maintain your hoses and their couplings in good working order, but sometimes Mother Nature intervenes in the kind of rust and corrosion. When that occurs, you’ve got a few choices to attempt to get that the coupling unstuck. At the worst-case scenario you are going to have to cut back the rotating coupling — a component which tends to cost over a standard, non-rotary coupling — however it might be the only option.
Easiest to Hardest Solution
The first step is to spray a bit of spray lubricant on the coupling. Use a toothbrush to work it in the inside threads a bit and allow it to sit on the threads to get half an hour. Then wrap a pair of pliers around the coupling and hold the opposite end with a firm grip. Now, attempt to loosen it. The pliers should provide you a bit more torque. If this does not work, try removing the coupling all together. The Family Handyman recommends cutting two slits to the coupling with a Dremel watched and then removing those cut bits together with your pliers. If the coupling is attached to a tap, take more care not to cut in the tap threads. With the hose coupling away, repair the hose having a replacement coupling set, available at most hardware shops.