A snap-on end cap to seal the flange top of syringe barrels. Quick attachment and removal. The cap snaps into place with clips that hold onto the barrel top. End caps are ideal for air-tight storing of filled syringes. Low level inner plug does not excessively obtrude into syringe barrel. Compatible with all standard 30cc and 55cc size syringe barrels. Silicone free components. These items ship direct from stock. Moulded from polyethylene.