Measuring stick for your waste tank Made of stainless steel. Provides reliable indications of when the septic tank should be emptied. Withstands rough handling and vacuum suction. Easy to clean as the protective tube can be dismantled without tools. Can be connected to KUS's septic tank instrument. 1 1/4" thread. KUS comes from one of the world's largest manufacturers of sensors and instruments for the marine industry. Among other things, the factory manufactures the Wema instruments and KUS is 100% compatible with Wema.