FAQ - Proportioner - General Topics

Q: What is the difference between the Flex-Gap and Aire-Gap backflow prevention devices? What do they do?

A: Both perform the same function of preventing a reversal of water flow which can siphon chemical back into the water supply, however they operate on two different principles. Flex-Gap uses a sleeve that expands (or "flexes") when water flows through it. When the water flow stops, the sleeve contracts acting as a one-way valve, preventing any reversal in water flow. The Aire-Gap has an open space (or "gap") that the water stream shoots across. When the water flow stops, there is no possible way for the water flow to reverse.