LiftMaster K77-37857 Operator Housing Cover for RSL12UL

Replacement Operator Cover for LiftMaster RSL12U/UL Slide Gate Systems

The LiftMaster K77-37857 is a genuine replacement cover housing designed for RSL12U and RSL12UL slide gate operators. Finished in gray or black (appearance may vary), this OEM part restores the operator’s weather-resistant enclosure and ensures continued compliance with UL325 safety standards. Also known as K77-37855, this cover is built to protect internal components from the elements and maintain the gate system's professional appearance.

Key Features

• Genuine LiftMaster® replacement cover
• Compatible with RSL12U and RSL12UL slide gate operators
• Restores protective enclosure to maintain weather resistance and UL compliance
• Durable construction in dark gray finish (color may vary by batch)
• Also known as: LiftMaster part number K77-37855
• OEM fit and finish for easy replacement

Technical Specifications

• Model Number: K77-37857
• Alternate Part Number: K77-37855
• Application: Replacement cover for operator housing
• Compatibility: RSL12U, RSL12UL slide gate operators
• Material: UV- and weather-resistant composite
• Manufacturer Note: Always confirm compatibility with parts manual

Conclusion

The LiftMaster K77-37857 Operator Cover is a direct OEM replacement for damaged or weathered enclosures on RSL12U/UL gate operators. Designed for long-term outdoor durability and safety compliance, it ensures continued protection and system reliability.