Measurit helps engineers to design and specify Tideflex and Checkmate non-return / check valves for wastewater and stormwater drainage systems. We also assist local authorities and water utilities to replace ineffective flap valves with our Tideflex rubber duckbill valves on river and coastal outfalls. Tideflex valves are self-clearing and free-draining but can withstand rough seas and high back pressures. Contact us today to find out more.