KIMAX precision bore buret is permanently marked with an individual serial number. Supplied with a Certificate of Graduation Accuracy. Filling tube accepts 1/4 inch I.D. flexible tubing. Filling is through the stopcock. KIM-KAP dust cap is included. Scale is durable white enamel. Designed from ASTM Specification E287, Class A requirements. Replacement stopcock is 41530F-2.