Thanks for your wonderful website!
Delta offers three Shower volume control cartridges:
Single Function pressure balance cartridge (does not remember last temp [pressure] setting)
Dual Function pressure balance cartridge (remembers last temp [pressure] setting)
Dual Function thermostatic cartridge (remembers and dynamically adjusts actual temperature setting)
Are you familiar with the Delta shower TempAssure? If so, how well does it work?
Lee & Amy
Actually NONE of them remember the last volume setting, and the pressure is NEVER adjustable on any of them either.