The Neutrik NDJ Filler Plug is a black dust cap plug designed for audio and video connectors. Manufactured by Neutrik, it serves as a protective component to prevent dust and debris from entering unused connector ports. This is typically used in professional audio equipment settings to maintain equipment integrity. https://elecena.pl/product/28914828/neutrik-ndj-filler-plug-black-1-piece-prevents-wiring-errors-amp-dust 2025-06-07 https://elecena.pl/product/28914828/neutrik-ndj-filler-plug-black-1-piece-prevents-wiring-errors-amp-dust 2026-03-14