Autosampler Vial Caps and Closures. Fisherbrand™ Manual Crimper, Steel, for Flip Top/Flip Off Seals or Flip Tear Up Seals. Crimping tools provide a reproducible, secure vial closure. Pricing and Availability. Fisherbrand™ 13mm PP Screw Cap, 13-425 thread. Polypropylene caps are chemically inert and suitable for most chromatography applications.