American Plumbing Partsmaster MXMS-EXT Deep Rough-in Stem

Product Description

The American Plumbing Partsmaster MXMS-EXT is a deep rough-in stem designed as a replacement component for Mixet-style single-handle shower and tub valves. The deep rough-in stem extends further into the valve body than a standard stem, making it the correct choice when wall tile, thick surround material, or non-standard rough-in depth places the valve body deeper than a conventional stem can reach. Licensed plumbers and experienced service techs install this part during valve rebuilds and service calls where the original stem has worn, cracked, or lost its ability to seal properly.

This stem is used in residential bathroom applications, specifically in shower and tub-shower combination fixtures that use Mixet single-handle valve cartridge-and-stem assemblies. It is the correct selection when a standard-depth stem does not reach the handle mounting point due to extended wall depth. This part suits retrofit and repair scenarios where matching the original Mixet stem configuration is required to restore proper hot and cold water mixing function.

Key Features

• Extended deep rough-in depth for thick-wall or non-standard installation scenarios
• Direct replacement for worn or damaged Mixet-style valve stems
• Restores proper single-handle hot and cold water mixing function
• Designed for use in tub and shower valve repair applications

Compatibility

Designed as an OEM-style replacement stem for Mixet single-handle tub and shower valves requiring a deep rough-in configuration.

Installation Notes

Installation should be performed by a licensed plumber. Shut off the water supply to the fixture at the nearest isolation valve or at the main before beginning any disassembly. Remove the handle and trim before extracting the existing stem. Follow all applicable local plumbing codes, including IPC requirements, when performing valve stem replacements.