13-425 4ml Sample Vials. 13-425 screw thread caps, septa, and vials are designed for specific use with the Waters WISP 48-Position Autosampler. Vials are manufactured of Clear, Type 1 Class A or Amber, Type 1 Class B borosilicate glass and include a write-in patch for sample identification. Caps are made of high quality polyproylene to exact