Thank you for your question, Peter! This cap with adjusting ring is mainly found on kitchen and lavatory models manufactured in 2006 and before. The RP1050 is the same cap assembly without the adjusting ring as the new cam and packing assemblies no longer need this ring. This is the same part for the 600 series showers but not the same size as a current shower series bonnets and you will need to refer to your maintenance and installation manual for the correct part number for your series.
Best regards, Edward
Date published: 2018-11-26