Overflow Siphon Duo with Backflow Prevention is ideal for a large plastic or concrete Tanks. The Duo with Backflow Prevention has a 110 mm inlet for accepting dirty water that runs through to an outlet， this feature saves drilling another hole in the Tank. The integrated Backflow Prevention prevents contamination from occurring with overflow. Using an integrated Overflow and Backflow Prevention Valve saves time and money not having to assemble two components together.

Food grade high quality polyethylene construction

Accepts high volume of water flow

Skims the top of water in rainwater tanks

Overflow siphon and odor trap suction of surface water in rainwater tanks