Kimax® flask calibrated to contain, with a graduation ring blasted on the neck. With a marking spot. Supplied with a yellow and blue closed-bottom linear high-density polyethylene stopper to fit in the ST ground neck. Enlarged top of the stopper will protect the neck if the flask is tipped over. Designed from ASTM Specification E288, Class B requirements. Replacement stopper is Cat.No. 6-28160R.