SS-2in2out-3Y-MIB fiber closure is made from imported high-intensity engineering plastics(ABS) and formed the shape with plastics under high pressure. It is in the shape of HALF rectangle, with the advantages of less weight, high mechanical intensity, corrosive-resistance, anti-thunderstruck and long service life. The case body and cable entrance are sealed with adhesive rubber strip(non-vulcanized) and sealed tape. Reliable sealing capability. It can be re-opened and easy to maintain. Unique disposition of 4 different cable loops(φ12.5，φ17，φ20，φ22) enables user to choose different outer diameter according to actual conditions, It enhances the reliability of the cable entrance sealed.