LSS_044_ATP LSS Series 3mm Moisture Sealed Light Pipe. Available in different length and colors and fit into 0.171” (4.34mm) panel hole diameter with a panel thickness of 0.031” (0.8mm) to 0.094” (2.39mm). Easy installation - insert light pipe through panel hole and press on retaining ring to secure unit to panel. Then slide PCB into position aligning LED with end of light pipe unit.