This part is a 3 7/8" Cal Spa Diverter Cap Silver Teardrop Style only. 

This Diverter Cap Slides on the Diverter Valve Stem is used to operate the Diverter Valve and is for Cal Spas.  

This Part is used in Cal Spa Hot Tubs only. 

This listing is for the Cap only the valve and other parts are sold separately.