Kimax® cylinder with a polyethylene stopper. Designed from ASTM Specification E1272, Style 2, Class B requirements. Stopper has a closed bottom and is made from linear, high density polyethylene to fit the ST ground flask neck. The enlarged top of the stopper protects the neck if the cylinder is knocked over. Single metric scale is durable white ceramic enamel. Heights given below do not include the stopper. Replacement stopper is Cat.No. 6-28160R.