These were just as i wanted at a decent price. 3 different sizes for all jobs but all 3 have the same flaw, where they clamp onto the pipe, the jaws are not parallel so when "locked" onto a pipe, they dont seal the pipe off so pertrol or the liquid just runs out as if they were not attached.
unless the pipe is really thick, save your money and but something else
Went back to the old method of locking mole grips covered in plastic so not to damage the pipes