In the field of waste water technology, we have specialised in backwater protection in waste water pipes. Our Stop Silent SL13 backwater protection from Lasso Technik AG is suitable for simple and quick installation in industrial and private sewage systems. In addition, it can be used as a frog and amphibian flap as well as an airtight odour valve in sewage technology. Furthermore, our technology for waste water is optimally suited for installation in drain pipes and control shafts with a back pressure of up to 0.5 bar.