How does an LC optical module dust plug prevent fiber optic contamination? It blocks dust from entering SFP ports, maintaining signal integrity and protecting optical lenses by providing a secure, sealed cover when ports are not in use. Disclaimer: This content is provided by third-party. Used in Optical Fiber Communication Transceiver Modules SFP, SFP+, QSFP, QSFP28,GBIC and Other Products;. Please let me know the angle you need and all your requirements, such as whether you want burned balls, gold plating, and whether you want nickel tube assemblies, etc.