That doesn't make sense. It's a high pressure swivel, and I expect it to swivel under high pressure.
Seriously! How many things are engineered to "Work as Advertised" only to find out they Don't! By design, the higher the pressure, the harder it is to swivel. At 1200 PSI pressure, the nylon washer is getting compressed pretty hard against the SS face inside the housing. So by design, if they are forced to swivel under high pressure, the nylon washer just won't last long. As long as you keep buying them, they will keep making them and selling them to you! I haven't replaced a SS swivel at the boom and gun in 8 years, only because I have the BB swivels 16" down from the boom....
After work today, I started a bay and just walked in circles. The SS swivels at the boom and gun stayed stationary and the BB Fluid Controls swivel did all the work. I tried spinning the SS swivels and they are significantly harder to spin than the BB swivel. In the beginning I watched people fighting with the hose when it bound up from the stiffness of the SS swivels while under pressure. Now you can walk around the car with ease with the BB swivels doing all the work...With one installed inline down from the boom, there is no side pull...Helping them to work easier and last longer.