N18 Headspace screw neck vials offer moreconvenient, consistent,and safer sealing processcompared to crimping type (better reproducibility).No risk of inaccurate or inconsistent crimp results.Due to its thinner septa,it·s suitable for SPME aswell as for Headspace.Often used on cTC CombiPAL and identically constructed autosamplers aswell as on PerkinEimer instruments.