Screw Caps w/Septa for 4 mL Screw Thread Vials. National
Manufacturer: National Scientific Company (Thermo Scientific)
These polypropylene screw cap won¹t contaminate sample when syringe needle is inserted, unlike phenolic caps that can flake. NC4015-5A SepCap has integral septa made of 0.010" polypropylene; therefore, septa do not need to be ordered. NC4015-30A, NC4015-40A, NC4015-75A, NC4015-45W are pre-assembled with septa. 13-425 thread finish.