This part is a 2 1/2" Titanium colored 1" Waterfall or Neck Jet Control Cap with O-Ring Kit.
This Cap Screws onto the Control Body that measures about 1 3/4" wide and Slides over the Diverter Valve Stem is used to operate a Waterfall or Neck Jet Valve.
This listing is for the Cap, (1) Large O-Ring & (2) Small O-Rings only, the valve is sold separately.