Special screw with the protection of a distributor valve emptying nozzle

摘要

The screw has a core (1) with a screw screw screw, a cylindrical head (2) with a hexagonal socket (3), and an axial release channel (4). The cylindrical head (2) is made of an outer screw on which is twisted a screw (5) with an inner screw and a perforated forehead part, the depth of the threaded screw socket (5) is greater than the cylindrical head height (2) by half the head height.