RP2391 Shower Faucet Knob Compatibility with Delta 600 series: single knob handle tub/shower faucets (except Monitor, ScaldGuard, and Delta Mix) Compatible with RP212 ball assembly: uses a diamond offset hole internal structure; suitable as a singlehandle faucet shower/tub kit for RP212 ball assembly Material and durability: quality transparent acrylic that resists corrosion and rust; sturdy construction designed for regular daily use Polished finish: sleek, classic look that complements a wide range of bathroom decors and color schemes, providing a clean, sophisticated update to your shower Benefits and purpose: reliable replacement for a worn or damaged knob, maintains proper control of water flow and temperature, designed for longevity Use scenarios: Replacing a broken or wornout knob on a Delta 600 series tub/shower faucet Upgrading an older knob to a transparent acrylic option for a refreshed bathroom look Repairing a shower/tub system that uses an RP212 ball assembly with a diamondshaped internal hole configuration