Lasso Technik AG 

Welcome to Lasso Technik AG – Your Swiss Expert for Check Valves and Backwater Protection.

Since 1942, we have been developing and manufacturing innovative solutions in Basel as a family-owned company – designed for reliable, durable, and maintenance-free use in both drinking water and wastewater applications.

Our Stop Silent® check valves (Type AS) are used worldwide in industrial and potable water systems.

Since 2013, our SL13 backwater protection valve has provided reliable protection against backflow, flooding, amphibians, unpleasant odors, and disturbing flow noises.

In our videos, we show how our products work, where they are used – and how they help you effectively prevent damage.

Learn more at: www.stopsilent.ch