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optical tube tunnel (light pipe) is a critical lightguiding component for Optomaseries projectors. With accurate physical size of 25.0mm8.0mm6.0mm, it is engineered to replace defective, scratched or degraded original optical tunnel for ES556, OEX925, X316ST, OSX827ST and OSX925 models. It homogenizes transmitted light inside the optical engine to deliver even illumination across projection screen. Damaged optical tunnel will result in dark spots, brightness drop and uneven image performance. This replacement part fits into original opticalengine position directly. Professional installation is recommended for opticalcomponent assembly. Please confirm your projector exact model and physical dimension requirement before ordering to avoid mismatch.