Arrived today due to a faulty shower cartridge. Upon our evaluation of the system and key components w noticed a few things. Failed prv, failed thermal expansion tank, and a 15 year old water heater. We advised taking care of these issues before a bigger issue arises. While completing this work we also took apart the shower valve that was having issues. We did extensive research but could not find the cartridge replacements. Customer will speak to his wife about either replacing the shower valve with ours, or providing one themselves. Restored water and checked for proper function and made sure there were no leaks.