The LiftMaster 50-17750 Pneumatic Hose End Plug Kit is a genuine OEM replacement part designed to terminate and seal the far end of an air hose used with a pneumatic sensing (reversing) edge on commercial overhead doors and gate systems. By closing the open end of the hose opposite the air switch, it preserves the internal air column so that compression of the bottom edge produces a reliable pressure change to signal the operator to stop and reverse, supporting entrapment protection on rolling steel doors, sectional doors, dock doors, and other industrial/commercial applications.
This kit is intended for LiftMaster pneumatic edge installations and compatible hose/air-switch setups used with LiftMaster commercial door operators. The plug itself requires no wiring or programming; install at the end of the hose opposite the air switch, making a clean, square cut, fully seating the plug, and securing per the manufacturer’s instructions. After installation, leak-test the edge and verify activation across the full width, then perform operator safety checks in accordance with UL 325 and local codes. Use as a replacement part or maintenance upgrade to restore proper function to pneumatic sensing edge systems on compatible LiftMaster equipment.