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Finneran’s 24-400mm Closures with Patented Top Hat Septa for Sampling Vials


J.G. Finneran is the original designer and manufacturer of the Patented Top Hat™ Septa assembled in a polypropylene 24-400mm closure for use with 20mL, 30mL, 40mL and 60mL sampling vials

No need for bonding, the .125” thick Top Hat™ PTFE/silicone septa and closure are designed to provide a positive physical lock to assure that the preassembled components arrive intact.  The unique septa/liner is molded to provide a leak proof seal.


  • For use on 20mL, 30mL, 40mL and 60mL capacity EPA V.O.A. clear or amber vials
  • Unique liner shape mechanically locks into closure, preventing contamination from dropped liners
  • Assembled Top Hat™ Closure and Vial available standard, pre-cleaned or pre-cleaned/certified in accordance with recommended EPA Protocol
  • Provides specified (0.120” silicone with 0.005" PTFE) liner thickness
  • Prevents closure cracking or stripping resulting from inadequate bottle/closure thread contact
  • 24-400mm polypropylene closure is available in black, white, red, blue, green and yellow
  • Polypropylene closure and Top Hat™ septa are autoclavable


Unique chromatography, biotechnology and environmental products manufactured by J.G. Finneran Associates are available internationally from a network of laboratory dealers.

For more information on the products and how to buy them, visit or contact J.G. Finneran Associates toll-free at +1‑800.552.3696 or +1-856.696.3605.


About J.G. Finneran

J.G. Finneran Associates is a manufacturer and supplier of unique and innovative products for the global chromatography, biotechnology, and environmental research communities. Our products deliver reliable performance while expediting and simplifying the analysis process. J.G. Finneran Associates is the original inventor and designer of many products that are commonplace in the laboratory. These items include Snap Ring Vials, Snap Top Caps, and Limited Volume Inserts with polymer bottom springs. We provide our customers with the tools to expand their capabilities, increase efficiency in the lab, reduce costs, and make their work easier.

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