STORAGE VIAL-INTERNAL THREAD – POLYLAB BRAND Posted on February 22, 2017April 25, 2017 by admin Another addition to the range of storage vials is this vial which has internal thread in it. The up fitted with an O-ring screws in to the vial and makes it a leakproof storage vial. CODE NO. PARTICULARS PACKING 64115 2.0 ml 500 pcs