In summer, when the sewer system warms up, effluent moves through the pipes due to small temperature differences. Bad odours then emerge from the sewer system and enter the building. Our Stop Silent Light backwater valve will solve this problem quickly and reliably thanks to its odor trap function. In addition, our check valve acts as a nose check valve (anti-frog) and prevents small animals from entering the pipe. Its main function is still its reliable protection system against backflow of pipe water with a back pressure of up to 0.5 bar