1.The ST fiber optic coupler connects two ST fiber optic stretches via its internal open sleeve to ensure an efficient connection between ST fiber optic patch cables. 2.ST Fiber Optic Tube Coupler with fine fixing nuts and washers allows ST fiber tube coupler to be securely attached to fiber optic junction boxes and various fiber application layouts. 3.ST fiber optic coupler has good interchangeability, good repeatability, good wear resistance, good temperature stability, high reliability and stability, low insertion loss, etc. ST fiber optic barrel coupler has an average additional loss of 0.2dB high loss and more than 1000 times plug and disconnect. 4.ST Fiber Optic Tube Coupler is manufactured with advanced grinders to ensure the center of the fiber is ground without drift. It is high temperature resistant, acid and alkali resistant, and has a zirconia ferrule with high hardness (high density), which has good optical properties and high mechanical stability.