ZGT has a full range of internal shutter adaptors including LC DX, LC Quad and SC SX. They are with IEC standard dimensions, which provide a good solution to improve or renew the adaptors in data center, central office or other places. The new internal shutter adaptors with same footprint as ordinary adaptors, you don’t need to make any changes to the existing faceplates and shelves. At the same time, you can get many benefits, such as convenient plugging, effective eye protection, and dustproof. ZGT holds patents on these products.