Help!! Coolant crossover plug broken!, need way to remove

[Cobra01Vert]

I was trying to remove my coolant crossover tube plug with a 1/4 ratchet when the square hole rounded off and will no longer accept anything to take it out, What can I use to remove it without wrecking the crossover tube. The tube is perfect and don't want to mar it up is at all possible.

Help!

Thanks

 

[03 cobra toy]

I was trying to remove my coolant crossover tube plug with a 1/4 ratchet when the square hole rounded off and will no longer accept anything to take it out, What can I use to remove it without wrecking the crossover tube. The tube is perfect and don't want to mar it up is at all possible.

Help!

Thanks

Locking Pliers on the edge of the plug worked for me Good luck