I have been in my new home 6 years. I have had to replace the RP10904 Cartridge assembly in the valve 5 times. It is in the master bath. It will last about 6-8 months and then start making a knocking noise when ever the water is turned off anywhere else in the house. It will continue to get worse and is very annoying. It is trash getting in the lower assembly in the spool piece that controls the pressure balance per Delta. I have disassembled a couple used ones and could find nothing. Delta will not say if it is ok to remove the spool but they recommend not to. I keep the water temp at 105 deg so scalding is not an issue. Anyone ever remove the spool piece to correct this problem? If so could you tell any difference in the valve operation? Thanks
- posted
16 years ago