I don't know yet.  I had this installed during renovation, to fit to WindemereThermostatic Shower Faucet Trim with Lever Handle SKU #: DLT548, but because I had Sheetrock and marble, an extension kit was needed for parts to fit, due to thicker struts now being used, as well as the Sheetrock & marble.  C&D Plumbing said backorder on extension kit was reason for an added 2 month delay waiting for part; final permits delayed due to this.  Fit to be tied.  They may  come this week, as kit arrived.  Waiting . . .