The septa recommended for use with Product No. 22162-U (Gas Sampling Bulb) are sold under Product No. 20668 (Thermogreen® LB-1 Septa, cylindrical). These cylindrical half-hole septa are designed specifically for air sampling applications using gas sampling bulbs and purge & trap glassware. They are sold in a package of 100 septa.
Product Nos. 20608 and 20633 (Thermogreen® LB-2 Septa, plug) are intended for use in the syringe injection system of Shimadzu brand gas chromatography (GC) instruments. The difference between 20608 and 20633 is simply the quantity of septa provided in a single package. 20608 ships with a package of 10 septa, whereas 20633 ships with a package of 50 septa.
