Burets Automatic Serialized and Certified Three Way PTFE Stopcock with Reservoir Bottle Class A Capacity (mL) 50. Interval Grad. (mL) 1.5 to 50. Subdivision (mL) 0.10. Approx. Assembled Length (mm) 1045. Tol. (mL) 0.05. [standard taper] Stopper Size Betwe