The RP75137 shower valve extension kit fits 3- and 6-setting diverter cartridges and is compatible with most tub and shower faucets. It also fits recessed valves like the R11000, adding approximately 1 inch of handle length to restore normal operation without altering the wall. Compatibility: Compatible with 3 and 6 setting diverter cartridges, fits most bathtub and shower faucets, and works with valves installed deeper in the wall Extends Handle Reach: When the diverter cartridge is installed too deep, this kit helps extend the handle length for normal operation, no need to modify the wall. Suitable for resolving issues with deeply recessed valves like the R11000 Easy Installation: Simply remove the existing handle, install the RP75137 extension stem, and tighten the screws to complete the setup Durable Material: The extension stems are made of brass, offering solid structure and resistance to moisture, suitable for long-term use in bathroom environments Complete Kit: Includes 2 brass extension stems, 2 long screws, 2 short screws, and 1 Allen wrench, convenient for installation or as a backup set