Moen 1255 31MM Cartridge Handle Replacement
A Moen Duralast® single-handle replacement cartridge used to restore proper operation and stop leaks in compatible Moen faucets that specify the 31 mm cartridge.
Key Features
- 31MM cartridge handle replacement (Duralast® 1-handle cartridge)
- Moen key feature: includes plastic retaining nut
- Intended for bathroom faucet applications
Compatibility & Applications
- Identified by Moen as the Duralast® replacement 1-handle cartridge for models 1255 & 160657.
- Must only be used where the manufacturer specifies this exact part number: 1255 (and/or 160657 where applicable).
Installation & Operation Notes
- Installation should be performed by a qualified plumber/installer or an experienced DIYer.
- Turn water supply OFF before disassembly; open the faucet handle to relieve pressure and confirm water is fully shut off.
- Identify the existing cartridge nut type. If it is brass, reuse it; if it is plastic, replace it with the new plastic nut. Hand-tighten the nut, then use a wrench to turn it an additional 90° (1/4 turn).
Maintenance & Troubleshooting
- This part is commonly replaced to address leaks at the faucet base or poor handle/valve operation tied to a worn cartridge.
- Confirm correct nut identification and proper tightening; mineral buildup can affect sealing and may require cleaning the valve body/mating surfaces during service.