History
TT KG was founded in 2009. Sanitation systems for railway operations are TT KG's business sector and core competence. Especially in Asian market

The company was restructured in 2013. As a result, EVAC covers  the entire market for vacuum sanitary systems in Asia.

In 2014, TTKG’s Chinese subsidiary, Shanghai Yicheng Vacuum Technology Co., Ltd., took over EVAC’s Asian distribution subsidiary.