Septum RS13, Stopper, Sleeve type, NMR, 10 Pcs/Package

10 flanged type stopper with a hollow plug and sleeve extension that folds down over the neck of vessel, tubing, etc. The diaphragm can be punctured with a syringe needle, resealing after needle is withdrawn. Stoppers are made from natural white rubber for use with 5mm O.D. NMR Tubes.