Polyethylene septumless screw caps for 9mm wide opening glass and PP (polypropylene) 1.5 mL vials. Qty 1000 in 10 packs of 100. Qty 1000 in 10 packs of 100. Suitable for PFAS analysis. NOTE: this cap is not resealable. For most samples requiring the cap to reseal, or for multiple injections per vial, caps with PTFE/silicone can be used, like 220-97331-27 (100/pk.) For PFAS analysis, use the PP/silicone cap 220-97331-91 (100/pk.)