I have followed a number of videos, but they all seem to have a copper (?) stem. At this point I'm up to some plastic piece that has no notches (namely around the metal piece) to use a wrench on.

Where do I go from here? I'm thinking that I would pull it out, but don't want to risk it without being sure.

It is leaking, so I'm probably looking to replace more than just the knob.

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[EDIT] I went to Lowe's and they cannot help me without knowing the brand. What would be a way to determine the brand? I do not see any labels, here are more pictures:


  • 1
    There may be yet another screw deep inside the hollow shaft of the plastic piece. If there is a screw in there, take it out and the plastic piece should pull straight out. Mar 4, 2013 at 12:31
  • There's almost certainly a screw down the shaft like Shirlock said. Mar 4, 2013 at 12:46
  • Do you want to replace the valve or just the handle? Does the other knob fit? if so, take it to a plumbing supply store. They will try it on new valve replacement stems (some have boards of stems already made up) and sell you a new handle
    – HerrBag
    Mar 4, 2013 at 13:36
  • The valve manufacturer may be on the back of the brass valve body. Do you have an access panel behind the tub?
    – HerrBag
    Mar 8, 2013 at 7:09

1 Answer 1


If you're not worried about possibly damaging the plastic bit (after all you are looking to remove it), I would get a pair of vice grips onto the square section at the back of the plastic piece.

This will allow you to either rotate the plug (to un-screw it, if it's threaded or to break the bond if it's glued in), or apply horizontal force to pull it out without damaging it too much.

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