Never needed other than the standard functionality of the Wanner. I have come up against a situation (non-mog) where I had two hands pulling on the trigger trying to get grease to flow into an old suspension. I have no idea what pressure that equated to in the gun and associated nipple but I suspect it was rather a lot, given the gun was locked solid to the nipple.. All that was required to free it was to use the thumb screw on top of the gun to release the pressure I had built up, and release the gun from the nipple with a twist.... Been using my Wanner for circa 50 years
