| 摘要 |
safety plug for use in plastic transport and storage oil or olive containers is disclosed, which plug is composed of two parts: the lower part 1 adaptable to the mouth 2 of the container and having the safety ring 7 with notches 9, and the equallydimensioned upper part 3 externally screwing and having the circular projection 13 of equal dimension to the safety ring 7 and notches 14 properly configurated in order to slide into the notches 9 of the safety ring 7 towards the screwing direction,notches and safety ring being thus mutually secured in the opposite direction; eventual forcing of the container is directly perceptible since the safety 10 detached from the safety ring 7 gets out from the notch 6. |
