LiftMaster K41-39254 Reflector and Bracket Kit
The K41-39254 reflector and bracket kit services the reflector side of a LiftMaster LMRRUL monitored retro-reflective photoelectric sensor installation. On this type of safety device, the sensor sends and receives the beam from a reflector across the protected opening. If the reflector is cracked, missing, loose, sun-damaged, poorly aimed, or mounted on a bent bracket, the gate operator may see a blocked or failed safety input and refuse to close, reverse unexpectedly, or display monitored photo eye faults. This kit is intended to restore the physical reflector and mounting hardware, not to bypass the safety circuit. The sensor head, wiring, alignment, entrapment zone layout, operator programming, and UL325 requirements all still need to be correct for safe operation.
Compatible With
- LiftMaster LMRRUL monitored retro-reflective photoelectric sensor applications
- Reflector-side service for compatible LiftMaster monitored photo eye installations
- Gate operator installations using LMRRUL as an approved monitored entrapment-protection device
- Not a replacement for the LMRRUL sensor head, monitored safety wiring, control board, or other photo eye models
Compatibility note: Use the installed opener, receiver, access-control system, or replacement parts diagram as the final match. Similar LiftMaster part numbers can have different frequency, security technology, connector, cabinet, or generation requirements.
Features and Specifications
| Manufacturer | LiftMaster |
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| Product Type | Reflector and bracket service kit |
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| Part Number | K41-39254 |
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| Application | Reflector-side replacement for LMRRUL monitored photo eye systems |
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| Compatible Operator Type | Gate operators using compatible monitored photoelectric sensors |
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| Safety Monitoring | For LMRRUL monitored retro-reflective photoelectric sensor applications |
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| Included Components | Reflector, bracket, reflector cover, and mounting hardware |
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| Notes | Does not replace the sensor head or bypass monitored entrapment protection |
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Also Known As / Related Part Numbers
Technician Note
Most ordering mistakes with this item happen when the part is matched only by appearance or brand name. Check the model number, learn button color, receiver model, system generation, and original part number before ordering.
Before Ordering Checklist
- Verify the exact manufacturer part number on the original part or parts diagram.
- Confirm the opener, receiver, keypad, gate operator, or access-control model.
- Check frequency, security technology, voltage, connector layout, and generation where applicable.
- Do not assume similar-looking LiftMaster parts are interchangeable.
- For safety devices and electrical parts, inspect the full system for wiring damage, moisture, corrosion, or unsafe operation.
Professional Advisory
Entrapment protection devices must be installed and tested according to the gate operator manual. Do not bypass monitored photo eyes or safety inputs. If a gate moves unsafely, reverses unexpectedly, or has missing safety devices, have the system inspected by a qualified gate technician.
Product Questions and Answers
Does K41-39254 replace the entire LMRRUL sensor?
No. This is the reflector and bracket kit. It does not include the LMRRUL sensor head or replace the monitored safety wiring.
Can a gate operate safely without the reflector?
No. If the LMRRUL reflector is missing or misaligned, the monitored photo eye system may not work correctly. Required safety devices should never be bypassed.
What symptoms can a bad reflector cause?
A missing, cracked, dirty, or misaligned reflector can cause the operator to refuse closing, reverse, show photo eye faults, or act like the beam is blocked.
Is this kit only for LMRRUL?
Yes. It is intended for LMRRUL monitored retro-reflective photo eye installations. Other photo eye models may use different brackets or reflector geometry.
What should be checked after installing the reflector kit?
Check reflector alignment, sensor status lights, wiring condition, operator safety input setup, and the full entrapment protection layout according to the operator manual.
