LC Adapter With Internal Shutter Deplex Quad Fiber Optic Adapters Singlemode Multimode LC Adapter Features Duplex and Quad available Single shutter and Dual shutter available Perfect fit Uniboot connector Dust and laser proof Ferrule end face not touch shutter PC/APC and Various color available Patented spring ensure stable fixed in panel Real one piece structure design Perfect fit 1/3U cassette IEC 61754-20 complaint RoHS/REACH and UL94-V0 inflammability complaint