Conical, Conical glass insert with polymer feet and mandrel interior the bottom for reduced residual sample loss when withdrawing sample into injector. Certified Vials, Caps, Septa, and Inserts at Competitive Prices - NET. advanced technology for HPLC, GC,. Sample Prep Microsampling (center-draining and fused-insert vials) Used with most autosamplers, including Aijiren. Tisch Snap Ring Vials w/Micro-Insert, 0.3 mL, 11mm, 100 Pack