Splice sleeves are used to distribute, connect and store the outer optical cables that come in and out of the ends of the cap. They can be used for overhead, manhole or embedded situations, etc. The closures are more secure due to the presence of a seal and offer greater protection. The integration of a sealing ring and an air valve makes it more suitable for relevant application areas. They are applicable to fiber bundle and traditional optical cables. The slit trays in the fastener rotate like books and provide enough space to wrap the optical fibers.This text is machine translated.