When replacing screw caps for Wheaton Scintillation Vials, be sure to get a proper fit by purchasing a Wheaton Screw Cap. Choose the right size screw cap for your vial (15-425, 22-400 or 24-400) and select the cap and liner material for your application.Wheaton has been supplying scintillation vials to the scientific community for decades. Researchers utilize the vials, not only for scintillation counting instrumentation but also as sample vials and for transferring samples from one lab to another. Quality, a Wheaton hallmark, allows you to depend on Wheaton for providing superior products for research requirements. For your scintillation or sample vial requirements select from glass, HDPE or PET vials.