PP. With PP stopcock and screw cap (83 mm). TPE gasket. Use for storing and dispensing solutions, media. Ideal for sterile water storage - can be autoclaved before refilling to stop recurring algae or bacterial growth. Excellent chemical resistance. Graduated to deliver in 1-gal and 5-l increments. Stopcock boss molded in one piece with bottle, for strength and leak resistance. Leakproof.