Nerrad Variable Bilateral Wrench 253mm Parallel Jaw Pump Plier [NTVBW310]

Jaws are constantly parallel in every adjustment position and incorporate a “ratchet” type action allowing you to release the handles slightly on the return stroke without removing the jaws from the fitting.
Can be used on anything from seized nuts to gold plated fittings without fear of damaging them.
Grip ratio of 10:1 from the handles to the jaws ensures there is zero lash on the fitting being worked on.