Clearboys are transparent, lighter and safer than glass, polycarbonate (PC) container is extremely tough and non-toxic. White polypropylene screw closures with TPE gaskets. Autoclavable for sterile applications. Useful for large-volume media and culture preparation, especially where visual inspection of contents for quality is important. Ideal for refrigerated or frozen storage of aqueous solutions. Graduated to contain in 1-gallon and 5-liter increments. Closure size is 83B (83 mm). NOTE: For best results, autoclave using a properly vented closure.