A cap for protecting the insertion device and inserted into other device features

The present application discloses a protective cap having a finger grip member, the window and the port. The protective cap may also have one or more clips (or snaps), the release of the one or more slots, and / or one or more guides. The protective cap 200 may also have a fill indicator and / or swelling materials. A plug system having a handpiece, a pusher assembly bracket and a cap having a window and the port. The cap is configured and dimensioned to the distal end of the coupling bracket. The system may also have inserted into the plunger with a plunger, said plunger having a mark is configured and dimensioned as indicated in axial translation of the push rod assembly of the handpiece.