Chemglass CG-3022-06 Rubber Sleeve Type Septum Stopper for 14/20-14/35 Outer Joints, Red Color (Pack of 100): Science Lab Rubber Stoppers: Amazon.com: Industrial & Scientific
Rubber Stopper, Natural Rubber Septum Stopper Fit for Lab - StonyLab
Silicone Rubber Septum for joints -B.J.Scientific Company, Mumbai
Chemglass CG-3022-08 Rubber Sleeve Type Septum Stopper for 24/40-24/25 Outer Joints, Red Color (Pack of 100): Science Lab Rubber Stoppers: Amazon.com: Industrial & Scientific
Rubber Septum 14/20 – Pine Research Instrumentation Store
ACE GLASS 9096-243 Rubber Septa for 14/20 mm OD Tubing, Red (Pack of 144): Amazon.com: Industrial & Scientific