Weight – 5 kg. Locking device secures the hatch over a concrete slab foundation, brick walls or well, that makes the protected door virtually invulnerable, and in this scenario can not be tearing the whole structure. Designed LLC PG "Finprom-Resource" product has a simple and original design. In the center of the hatch drilled one hole with a diameter of 36 mm, which is a keyhole. Drilling is performed by one worker and possibly on-site installation hatch. With the help of the head, rod and nut by one person lever-hinge mechanism is mounted on the lid.

Lock screw has a buttress thread, which prevents the corrosive "gripe" with the nut. Locking is performed manually using a special key. Key inserted into the keyhole and by rotation actuates the locking mechanism, which includes the levers at his disposal with a concrete slab foundation or brickwork hatch design also allows the key cleaning the inlet of all forms of pollution, making it easier to operate the equipment in all weather conditions. UZKL installed as the roads and on the green zone. Depending on the height of the neck well, the variant with an elongated rod. Saratov colleagues proposed closure device compares favorably with other low weight, its versatility, reliability, ease of operation and low value. By using this UZKL, preventing all access by unauthorized persons in the mine communication cable wells and reservoirs to prevent theft, and ensures the safety of the equipment. When drilling holes use a drill with carbide inserts.