XFO-135 rotary pressure cassette sub-boxes are primarily for outdoor city telephone lines and trunk cables between the connecting wiring, applicable to indoor and outdoor installation and overhead. Features: XF0-135 rotary pressure cassette outdoor sub-boxes are bureau line-card equipment using gas tight wiring, circuitry and U-shaped pressure cards. With organic sealing used to ensure core line connections are not exposed or oxidized, cable lines are waterproof and corrosion resistant, and extendable from 0.4 to 1.2mm to the core line. The boxes are built from high-quality cold-rolled steel, and designed so that cables can be inserted in one operation. The surfaces of the housings have been electrostatic coated to ensure that cold resistance, corrosion resistance, waterproofing and other protective functions meet the GB4208 standard.