Moen 1255 User Manual

1255 Cartridge and O-rings
Rem ova l a nd I ns t al l a ti o n
Tools needed
Replacing only
the spout O-rings:
Move to step 9.
Replacing the
1255 cartridge:
Move to step 4.
Grab the dome and pull
upward to remove.
OR
Locate the hole in either the front or back of the handle. If this hole is
covered by a small plug, pry the plug off to remove. Next, use the 3/32”
Allen wrench in the hole to unscrew the Allen screw. This screw does not
need to be fully removed, only loosened until the handle will slide off.
Caution: Always
turn your water
supplies off
before
disassembling
your faucet.
With the
supplies turned
off, move your
fau cet ’ s h andl e
to the “on”
position to
relieve pressure.

Moen 1255 Specifications

General

Material	Plastic
Model Number	1255
Lifetime Limited Warranty	Yes
Cartridge Type	Duralast 1255
Compatibility	Single Handle Faucets

Summary

Faucet Safety and Preparation

Water Supply Safety

Always turn water supplies off before disassembling your faucet to relieve pressure.

Handle Removal

Locate and loosen the Allen screw in the handle to allow it to slide off.

Dome Removal

Grasp the dome and pull it upwards to detach it from the faucet.

1255 Cartridge Procedures

Cartridge Nut Removal

Unscrew the 1255 cartridge nut counter-clockwise using the grey tool, pliers, or wrench.

Cartridge Removal

Lift the 1255 cartridge straight out of the faucet body.

Chamber Cleaning

Clean the inside of the faucet chamber with a soft brush, ensuring no debris remains.

Cartridge Alignment and Insertion

Align the cartridge tabs with the faucet grooves and insert it into the chamber.

Cartridge Nut Tightening

Tighten the new cartridge nut snugly, then turn an additional 90 degrees to secure.

Spout and O-ring Procedures

Crown Ring Removal

Gently pry up the black crown ring, being careful not to damage it for reassembly.

Spout Removal

Grasp the spout and lift it upwards to remove it from the faucet body.

O-Ring Location

Identify the location of the upper and lower O-rings on the faucet body.

Spout O-Ring Removal

Pry each O-ring out carefully, avoiding damage to the valve body.

Spout O-Ring Installation

Grease and install new O-rings onto the valve body grooves correctly.

Reassembly

Spout Reinstallation

Clean spout interior and slide it back flush with the faucet base.

Crown Ring Reinstallation

Secure crown ring into the spout top, tucking tabs under the channel edge.

Final Check

Gently pull spout upwards to ensure the crown ring is seated properly.