How to remove this tap valve

faucettaps

enter image description here
how to remove tap valve? Any suggestions?

Best Answer

The round piece that is around the valve stem appears to be threaded into the outer body of the valve assembly. The internal hex shaped hole is used to accept a tool that fits over the valve stem and engages the inside shape to allow that round piece to be screwed out.

enter image description here

It is unlikely that a standard tool exists to extract the valve assembly and it may be necessary to contact the manufacturer to check on the availability of a specialized tool.