How to remove this tap fitting

[victork]

Hi,

I am new to the forum and hopefully posting this in the right place. I'm trying to replace my existing kitchen tap+faucet with a new mixer and having trouble figuring out how to remove this tap fitting. I have a feeling that the two U shaped notches (circled in photo) have something to do with it but can't find a tool to undo it.

Any suggestions would be greatly appreciated.

Victor

 

[Mr_David]

If you're removing to replace, then just grab it with some pliers and twist it off.

 

[jeffmattero76]

Otherwise you can use a stiff piece of metal that will span both cutouts and twist.

Or simply use a hammer and a screwdriver to tap that counterclockwise. You may want to spray some penetrant on it first. I would suggest something other than WD40.