Seized Filling Loop Tap

[fadsarmy]

Hi, any ideas on how I can get this seized tap to turn? I can get it replaced in a couple of weeks but I need to fill the boiler as the pressure is on the low side. Any ideas what size they are so I can have it ready for the plumber when he comes?

 

[ShaunCorbs]

You are turning the right way ? I only ask as it will only turn one way the lever / handle has stops if you look you will see it hard against the closed one

Worst comes to the worst undo the screw that holds the handle on little pozi and remove the handle use a set of pliers to grab the brass flats and slowly turn it unit you hear water flowing and keep an eye on the pressure guage and Remember to turn it off eg flats horizontally