DiffLok™ caps

Tubes on all Markes’ ULTRA autosamplers are sealed with unique DiffLok caps, which simply push onto both ends of every tube. DiffLok caps utilise Markes’ patented diffusion limiting technology (also found in SafeLok tubes), to preserve sample integrity by preventing both analyte loss and artifact ingress.

Even volatile analytes are confidently preserved on sorbent tubes giving identical recovery for standards at the beginning and end of a 100-tube sequence. DiffLok caps have been field proven to seal sampled and blank tubes much more effectively than older PTFE push on caps incorporating PTFE-coated O-rings.

DiffLok caps are available for ¼” and 6 mm O.D. tubes and in stainless steel or inert coated stainless steel. Inert coated caps are only ever required for the sampling end of the tube and only when analysing reactive compounds. Replacement O-rings are also available for routine maintenance of the caps.