13mm Seal, Open Top Hole Cap, Aluminum, Unlined. The Unlined Aluminum Seal exposes the top of the rubber septum to the syringe. A rubber septa with rubber formulations of gray butyl, natural rubber and silicone can be purchased separately. The aluminum seal can be attached to a serum bottle or vial with a WHEATON® Crimper and easily removed with a WHEATON® Decapper.
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