Plunger has barrel shaped main body, flat end surface matching front of receptacle's interior, two peripheral sealing lips, and grooved incisions

摘要

The barrel-shaped main body (1) of the plunger has a flat end surface (2) and at least two peripheral sealing lips (3) each of which has grooved incisions (4) at at least one point. The grooved incision(s) of ones sealing lip is/are staggered in position in relation to the grooved incision(s) of the other sealing lip. The front (5) of the plunger matches the end surface of the interior of the receptacle into which it fits.