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Moen Solutions

B8-1H Lav 1225 Knob

1 Handle Lavatory 1225 Knob Style: Removal and Installation
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Tools Needed:

Large Pliers

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Phillips Screwdriver


Flathead Screwdriver


Soft Brush


Removal of the Handle

1. Always turn your water supplies off before disassembling your faucet.  With the supplies turned off, move your faucets handle to the "on"position to relieve pressure.

2. Remove handle cap using flathead screwdriver. Then using a Phillips screwdriver, remove the handle screw and knob.

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3. Slide the stop tube and flat steel washer off of the faucet.

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Removal of the Cartridge

4. Remove the cartridge clip using a flathead screwdriver.

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5. Place the black or white plastic cap, included with replacement cartridge, over the top of the old cartridge and then rotate one-quarter of a turn in either direction. Then, remove the cap.

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6. Pull up on the brass stem to remove cartridge.

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Cleaning and Flushing of Valve body

7. Clean the inside of the valve body with a soft bristled nylon brush to remove any calcium buildup. After cleaning, place a bowl on the open valve to redirect water into the sink. Next, turn on water supply lines slightly for a few seconds to flush clean water through the open valve.

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Installing the 1225 Cartridge

8. Slide the new cartridge into the brass valve body. Ensure the plastic ears on top of the cartridge are at the twelve and six o’clock positions.

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9. Slide the copper clip back into the valve body on top of the cartridge. If you have trouble installing this, please refer to the special note at the end of this document.

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10. You may now work in reverse from steps 3 through 1.

Special Note for Reinstalling the Cartridge Clip

If the cartridge clip will not go all of the way in, there are two possible causes. Check the following and adjust to make correct:

The plastic tabs of the cartridge must be positioned perfectly at the twelve and six o’clock positions.


Solution: If the tabs are not correctly aligned, use the plastic twisting tool to rotate the cartridge and perfectly align the tabs at the twelve and six o’clock positions.


The plastic tabs of the cartridge must be at the same level or lower than most the brass valve body.

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Solution: If the tabs are above brass, use the plastic twisting tool to push down on the cartridge. This evenly distributes the pressure to the cartridge shell.


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