There is flange on the top and bottom of level meter to connect with container. User can see the actual level through the glass. There is safe steel ball on the top valve and bottom valve of the level meter. If the glass plate is broken, the steel ball will auto seal by the container pressure to prevent the liquid output. There is plug screws on the two ends of the UBX instrument. UBX-A has G1/2＂ needle valve which is used to outlet the liquid when sampling, washing and repairing. The level meter is equipped with hot steam jacket and can be used in thick, easy to freeze liquid.