PC. With PP screw cap, Ø 83 mm and TPE gasket. These carboys are transparent, lighter and safer than glass, PP container is extremely tough and non-toxic. Useful for large-volume media and culture preparations, especially where visual inspection of contents for quality is important. Ideal for refrigerated or frozen storage or aqueous solutions. Graduated to contain in 1 gal and 5 l increments. Autoclavable. Leakproof.