Septa, 17.5mm, Headspace, Reddish Brown Butyl Rubber / Grey PTFE. For use in 18mm Aluminum, Screw Caps, sold separately. MicroSolv Brand. 1000/CS.
Butyl Rubber / PTFE Septa, Durometer of 55 Shore A (hardness) and slightly thicker 1.6mm compared with other Septa for 18mm Screw Caps makes these Caps useful as Septa or Liners with ND18, Precision Thread Screw Caps for Headspace.
Supplied in a polyethylene bag.