This anaerobic jar is specially formulated for temperature stability and durability. It’s unbreakable, lightweight, transparent and, of course, autoclavable. Double screw clamp, coupled with the patented Quad Ring, ensures a more positive seal, superior to conventional O-rings. It also doubles as a handy carrying handle. The 3/8” thick anodized aluminum lid won’t warp, and it’s guaranteed to resist cracking or breaking for ten years. Shipped complete with a stainless steel rack to accommodate 100mm petri dishes and a stainless steel catalyst basket.