One-vial, two-vial, and three-vial systems are availableLV-PVA vials contain low viscosity polyvinyl alcohol. SAF vials contain sodium acetate–10% formalin.Bulk poly bottles of LV-PVA for preservation and transportation and trichrome stain for the identification of parasites are also available.C & S vials are intended for the transport of enteric pathogens and microbiological examination; all other vials are intended for the preservation and transportation of fecal samples for parasitology examination.