ULND21 : Delta Single Lever OEM Faucet Cartridge, for 1300/1400 Series
Delta Single Lever Tub and Shower Cartridge. The OEM number for this part is RP19804.
This cartridge is for use in Delta Monitor 1300 and 1400 series tubs and showers made 2006 and earlier.
Possible Repair Solution For:
Leaking bathtub or shower faucet, inconsistent water temperature.
Please Note: This is intended as a guideline only, as other items can cause the same symptoms.
Remember to always shut off the water supply before disassembling the tub/shower valve.
Note the Cartridge before 2006 has a Blue Base and after 2006 has a Grey Base (See RP46074 for Grey Base)