VIAL, STOOL PARA-PAK (20/PK) Empty vials for transport of specimens that do not require a transport medium or fixative ParaPak Collection Vials are 30 mL plastic disposable devices designed for the collection, preservation and transportation of stool specimens for intestinal parasites examination The leak-proof screw caps are equipped with a special spoon for easy collection of the specimen The vials fit perfectly with the ParaPak MacroCon filtration system, creating a completely closed system, minimizing the exposure to potentially infectious agents