Plumber anons i need help. Pic related adapter is stuck dead and i need to get that whole thing out. Using regular tools is not an option because there is a wall right next to it and they simply don't fit. I got myself a "pipe" wrench, idk how it's called in english, it's literally a pipe shaped like a hexagon at the end, BUT the whole thing spins when i try to unscrew the adapter including the part inside the cistern.