Introduction
This manual provides detailed instructions for the installation, operation, maintenance, and troubleshooting of your Moen Faucet Lavatory 2H CS MAT BLK 84311BL. Please read this manual thoroughly before installation and use to ensure proper function and longevity of your product. Keep this manual for future reference.
Product Overview
The Moen Faucet Lavatory 2H CS MAT BLK 84311BL is a two-handle centerset lavatory faucet designed for bathroom sinks. It features a matte black finish and lever handles, providing both aesthetic appeal and functional control. This faucet is designed for deck-mount installation and includes a pop-up drain.

Image: Front view of the Moen Faucet Lavatory 2H CS MAT BLK 84311BL, showcasing its matte black finish and two lever handles.
Key Features:
- Model: 84311BL
- Finish: Matte Black
- Handles: Two lever handles
- Mounting Type: Deck Mount
- Included Components: Faucet, Pop Up Drain
- Dimensions: Approximately 8.25"D x 8.5"W x 12"H

Image: Diagram showing the dimensions of the Moen Faucet Lavatory 2H CS MAT BLK 84311BL, indicating height, width, and depth.
Before You Begin
Tools and Materials Required:
- Adjustable wrench
- Basin wrench (optional, but recommended)
- Phillips screwdriver
- Plumber's putty or silicone sealant
- Teflon tape
- Safety glasses
- Bucket and towels
Pre-Installation Checklist:
- Verify all parts are present according to the packing list.
- Ensure your sink has a three-hole configuration for proper installation.
- Turn off the main water supply to the bathroom.
- Clear the area under the sink for easy access.

Image: Diagram illustrating a sink with a three-hole configuration, suitable for this faucet model.
Setup and Installation
Follow these steps carefully for a successful installation.
- Remove Old Faucet (if applicable):
- Turn off water supply.
- Disconnect water supply lines from the old faucet.
- Unscrew mounting nuts and remove the old faucet.
- Clean the sink surface thoroughly.
- Install New Faucet:
- Apply a thin bead of plumber's putty or silicone sealant around the base of the new faucet.
- Insert the faucet body and handles into the holes on the sink deck.
- From underneath the sink, secure the faucet with the provided washers and mounting nuts. Tighten firmly but do not overtighten.
- Connect Water Supply Lines:
- Wrap Teflon tape around the threaded ends of the water supply valves.
- Connect the hot and cold water supply lines from the faucet to the corresponding shut-off valves. Use an adjustable wrench to tighten connections, ensuring they are snug but not overtightened.
- Install Pop-Up Drain:
- Follow the specific instructions provided with the pop-up drain assembly. Typically, this involves applying sealant to the drain flange, inserting it into the sink drain hole, and securing it from underneath with a washer and nut.
- Connect the pivot rod to the pop-up stopper and the lift rod.
- Test for Leaks:
- Slowly turn on the main water supply.
- Check all connections for leaks. If leaks are present, tighten the connections slightly until they stop.
- Run water through the faucet for a few minutes to flush out any debris.

Image: The Moen Faucet Lavatory 2H CS MAT BLK 84311BL installed on a bathroom sink, showing its integration with the countertop.
Operating Instructions
The Moen Faucet Lavatory 2H CS MAT BLK 84311BL features two lever handles for controlling water flow and temperature.
- Cold Water: The right lever handle controls the cold water supply. Turn the handle counter-clockwise to increase cold water flow.
- Hot Water: The left lever handle controls the hot water supply. Turn the handle counter-clockwise to increase hot water flow.
- Temperature Control: Adjust the temperature by mixing hot and cold water using both handles simultaneously.
- Water Flow: The further you turn the handles, the greater the water flow.

Image: The Moen Faucet Lavatory 2H CS MAT BLK 84311BL with water flowing from the spout, demonstrating its operational state.
Maintenance and Care
Proper care will ensure the lasting beauty and performance of your Moen faucet.
- Cleaning: Clean the faucet regularly with a soft cloth and mild soap. Rinse thoroughly with warm water and dry with a soft cloth.
- Avoid Harsh Cleaners: Do not use abrasive cleaners, harsh chemicals, or polishes containing alcohol, ammonia, bleach, or abrasive agents, as these can damage the finish.
- Aerator Maintenance: If water flow decreases, the aerator may be clogged. Unscrew the aerator from the spout, clean any debris, and rinse thoroughly before reattaching.
- Leak Prevention: Periodically check all connections for tightness to prevent leaks.
Troubleshooting
Refer to the table below for common issues and their solutions.
| Problem | Possible Cause | Solution |
|---|---|---|
| Low Water Flow | Clogged aerator; partially closed shut-off valves; debris in supply lines. | Clean aerator; fully open shut-off valves; flush supply lines. |
| Leaking at Base of Faucet | Loose mounting nuts; improper sealant application. | Tighten mounting nuts; reapply plumber's putty or silicone if necessary. |
| Leaking from Spout | Worn cartridge. | Replace faucet cartridge (refer to Moen's official support for part numbers and instructions). |
| No Hot/Cold Water | Shut-off valve closed; supply line kinked; water heater issue (for hot water). | Open shut-off valve; straighten supply line; check water heater. |
Specifications
| Attribute | Detail |
|---|---|
| Brand | Moen |
| Model Name | Moen Faucet Lavatory 2H CS MAT BLK 84311BL |
| Part Number | 84311BL |
| Mounting Type | Deck Mount |
| Finish Type | Matte |
| Material | Plastic (Note: Faucet body is typically metal, plastic might refer to specific components like handles or internal parts) |
| Number of Handles | 2 |
| Handle Type | Lever |
| Special Feature | Pop Up Drain |
| Product Dimensions | 8.25"D x 8.5"W x 12"H |
| Item Weight | 3.25 Pounds |
| UPC | 026508354797 |
Warranty and Support
Moen products are manufactured under the highest standards of quality and workmanship. This product is backed by Moen's comprehensive warranty. For detailed warranty information, please refer to the warranty card included with your product or visit the official Moen website.
For technical assistance, replacement parts, or warranty claims, please contact Moen Customer Service:
- Moen Official Website: www.moen.com
- Customer Service Phone: Refer to Moen's website for regional contact numbers.
When contacting support, please have your model number (84311BL) and purchase date available.





