Keep your Lippert slide-out traveling and stopping precisely where it should. The 124188 Stop Block is a direct-replacement component for above floor rack-and-pinion slide-out assemblies, preventing over-travel and protecting the room, wall seal, and drive mechanism from damage caused by a missing or deteriorated block.
Stop blocks are easy to overlook until one breaks, cracks, or goes missing entirely -- and then the slide-out can over-extend or fail to seat correctly against the coach wall. Lippert part 124188 is the OEM-specification stop block used in most Lippert above floor slide-out systems, restoring correct mechanical travel limits so your room retracts and extends without banging or binding.
At just 0.75 x 0.75 x 1.25 inches, this is a compact but structurally critical piece. Replacing it promptly prevents wear on the rack, pinion gear, motor, and slide-room seal -- all of which are far more expensive repairs.
Direct factory-spec replacement for Lippert above floor slide-out assemblies. No modification needed.
Measures 0.75 x 0.75 x 1.25 inches -- fits the original mounting location precisely.
Limits slide-out extension and retraction to designed mechanical stops, protecting the drive system.
Compatible with most Lippert above floor rack-and-pinion slide-out systems found across major RV brands.
In a Lippert above floor slide-out system, the stop block acts as a mechanical hard stop -- a precisely sized block that contacts a mating surface at the end of the slide room's travel range. When the block is intact, the motor and drive gear know to stop applying force. When it is cracked, compressed, or missing, the room can travel past its intended limit, straining the rack-and-pinion gear set, the motor, and the weatherstrip seal along the room's perimeter.
This is a wear item. UV exposure, road vibration, and repeated cycling can degrade stop blocks over time. Inspecting them during seasonal maintenance -- especially if you hear a clunk at the end of slide travel -- is good practice.
Lippert above floor slide-out systems use a rack-and-pinion or cable-driven mechanism mounted above the coach floor, typically visible as a horizontal rail and drive gear assembly inside a basement compartment or under the slide room's floor decking. Key components in this system include the motor, gearbox, rack, pinion, slide-out controller, limit switches, and stop blocks. The 124188 stop block works in conjunction with the limit switches to define and cushion the travel endpoints.