Closure screw made of plastic for bung containers

摘要

The problem of leakiness by deformation of a closure screw (1) when closing a bung container (3) by means of said closure screw (1) by screwing it into a threaded flange (2) provided for this purpose is eliminated due to the fact that a metal ring (12) is countersunk concentrically in the upper side (6) of said closure screw (1). <IMAGE>