The Supelco packed GC septum nut provides consistent septum tightness, resulting in better sealing and fewer bent needles. The nut contains a needle guide, ensuring that the needle consistently penetrates the septum in the same place, prolonging septum life. The guide also prevents the needle from striking the edge of the column. Each nut is supplied with easily interchanged 1/2 in. and 1 in. aluminum needle guides. The 9/16 in. stainless steel hexagonal nut head uses septa with a 9.5 mm diameter. For use with PerkinElmer (3920, 900, Sigma series), Agilent (5700), and other injection ports that accept a 1/4 in. Swagelok nut with 7/16 in. threads at 20/in.
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